10-12 Exercise: A water supply company

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A water supply company charges the water consumption, as follows:

a) Fixed amount of 10$.
b) For the first 30 cubic meters 0.6$/meter.
c) For the next 20 cubic meters 0.8$/meter.  
d) For the next 10 cubic meters 1$/meter.  
e) For every additional meter 1.2$/meter.   

Write a program that reads the water consumption in cubic meters and displays the bill.
寫一個輸入水的用量 輸出水費的程式

Example Input:

25

Output:

Cost: 25.00

Example Input 2:

44

Output:

Cost: 39.20

Example Input 3:
 

75

Output:

Cost: 72.00

 

[Exercise] Coding (C) - asked in Chapter 4: Expressions by (12.1k points)
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answered by (-141 points)
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prog.c: In function 'main':
prog.c:17:1: error: implicit declaration of function 'system' [-Werror=implicit-function-declaration]
 system("pause");
 ^~~~~~
cc1: all warnings being treated as errors
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answered by (-167 points)
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-----------Re-judge-----------
Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output
Case 3: Wrong output
Case 4: Wrong output
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answered by (-249 points)
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Case 4: Correct output
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answered by (-249 points)
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prog.c: In function 'main':
prog.c:6:13: error: format '%d' expects argument of type 'int *', but argument 2 has type 'int' [-Werror=format=]
     scanf("%d",a);
             ^
prog.c:6:5: error: 'a' is used uninitialized in this function [-Werror=uninitialized]
     scanf("%d",a);
     ^~~~~~~~~~~~~
cc1: all warnings being treated as errors
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answered by (-141 points)
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prog.c:1:9: error: #include expects "FILENAME" or #include ^ prog.c:2:9: error: #include expects "FILENAME" or #include ^ prog.c: In function 'main': prog.c:7:5: error: implicit declaration of function 'scanf' [-Werror=implicit-function-declaration] scanf("%d",&a1); ^~~~~ prog.c:7:5: error: incompatible implicit declaration of built-in function 'scanf' [-Werror] prog.c:7:5: note: include '' or provide a declaration of 'scanf' prog.c:7:17: error: 'amp' undeclared (first use in this function) scanf("%d",&a1); ^~~ prog.c:7:17: note: each undeclared identifier is reported only once for each function it appears in prog.c:7:20: error: expected ')' before ';' token scanf("%d",&a1); ^ prog.c:8:12: error: 'lt' undeclared (first use in this function) if(a1 < 30) ^~ prog.c:8:14: error: expected ')' before ';' token if(a1 < 30) ^ prog.c:9:9: error: implicit declaration of function 'printf' [-Werror=implicit-function-declaration] printf("Cost: %.2f\n",(a1*0.6)+10); ^~~~~~ prog.c:9:9: error: incompatible implicit declaration of built-in function 'printf' [-Werror] prog.c:9:9: note: include '' or provide a declaration of 'printf' prog.c:11:17: error: 'gt' undeclared (first use in this function) else if(a1 > 30&&a1 < 50) ^~ prog.c:11:19: error: expected ')' before ';' token else if(a1 > 30&&a1 < 50) ^ prog.c:12:9: error: incompatible implicit declaration of built-in function 'printf' [-Werror] printf("Cost: %.2f\n",(30 * 0.6+(a1-30)*0.8)+10); ^~~~~~ prog.c:12:9: note: include '' or provide a declaration of 'printf' prog.c:14:19: error: expected ')' before ';' token else if(a1 > 50&&a1 < 60) ^ prog.c:15:9: error: incompatible implicit declaration of built-in function 'printf' [-Werror] printf("Cost: %.2f\n",(30 * 0.6) + (20 *0.8)+(a1 - 60)*1+10); ^~~~~~ prog.c:15:9: note: include '' or provide a declaration of 'printf' prog.c:17:19: error: expected ')' before ';' token else if(a1 > 60) ^ prog.c:18:13: error: incompatible implicit declaration of built-in function 'printf' [-Werror] printf("Cost: %.2f\n",(20 *0.8)+(30 *0.6)+10+(a1 - 60)*1.2+10); ^~~~~~ prog.c:18:13: note: include '' or provide a declaration of 'printf' prog.c:19:1: error: implicit declaration of function 'system' [-Werror=implicit-function-declaration] system("pause"); ^~~~~~ cc1: all warnings being treated as errors
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Your program was not runnable because of the system fault, please submit again.

Sorry for the inconvenience
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prog.c:1:9: error: #include expects "FILENAME" or #include ^ prog.c:2:9: error: #include expects "FILENAME" or #include ^ prog.c: In function 'main': prog.c:7:5: error: implicit declaration of function 'scanf' [-Werror=implicit-function-declaration] scanf("%d",&a1); ^~~~~ prog.c:7:5: error: incompatible implicit declaration of built-in function 'scanf' [-Werror] prog.c:7:5: note: include '' or provide a declaration of 'scanf' prog.c:7:17: error: 'amp' undeclared (first use in this function) scanf("%d",&a1); ^~~ prog.c:7:17: note: each undeclared identifier is reported only once for each function it appears in prog.c:7:20: error: expected ')' before ';' token scanf("%d",&a1); ^ prog.c:8:12: error: 'lt' undeclared (first use in this function) if(a1 < 30) ^~ prog.c:8:14: error: expected ')' before ';' token if(a1 < 30) ^ prog.c:9:9: error: implicit declaration of function 'printf' [-Werror=implicit-function-declaration] printf("Cost: %.2f\n",(a1*0.6)+10); ^~~~~~ prog.c:9:9: error: incompatible implicit declaration of built-in function 'printf' [-Werror] prog.c:9:9: note: include '' or provide a declaration of 'printf' prog.c:11:17: error: 'gt' undeclared (first use in this function) else if(a1 > 30&&a1 < 50) ^~ prog.c:11:19: error: expected ')' before ';' token else if(a1 > 30&&a1 < 50) ^ prog.c:12:9: error: incompatible implicit declaration of built-in function 'printf' [-Werror] printf("Cost: %.2f\n",(30 * 0.6+(a1-30)*0.8)+10); ^~~~~~ prog.c:12:9: note: include '' or provide a declaration of 'printf' prog.c:14:19: error: expected ')' before ';' token else if(a1 > 50&&a1 < 60) ^ prog.c:15:9: error: incompatible implicit declaration of built-in function 'printf' [-Werror] printf("Cost: %.2f\n",(30 * 0.6) + (20 *0.8)+(a1 - 60)*1+10); ^~~~~~ prog.c:15:9: note: include '' or provide a declaration of 'printf' prog.c:17:19: error: expected ')' before ';' token else if(a1 > 60) ^ prog.c:18:13: error: incompatible implicit declaration of built-in function 'printf' [-Werror] printf("Cost: %.2f\n",(20 *0.8)+(30 *0.6)+10+(a1 - 60)*1.2+10); ^~~~~~ prog.c:18:13: note: include '' or provide a declaration of 'printf' prog.c:19:1: error: implicit declaration of function 'system' [-Werror=implicit-function-declaration] system("pause"); ^~~~~~ cc1: all warnings being treated as errors
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answered by (-141 points)
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prog.c:1:9: error: #include expects "FILENAME" or #include ^ prog.c: In function 'main': prog.c:6:5: error: implicit declaration of function 'scanf' [-Werror=implicit-function-declaration] scanf("%d",&a1); ^~~~~ prog.c:6:5: error: incompatible implicit declaration of built-in function 'scanf' [-Werror] prog.c:6:5: note: include '' or provide a declaration of 'scanf' prog.c:6:17: error: 'amp' undeclared (first use in this function) scanf("%d",&a1); ^~~ prog.c:6:17: note: each undeclared identifier is reported only once for each function it appears in prog.c:6:20: error: expected ')' before ';' token scanf("%d",&a1); ^ prog.c:7:12: error: 'lt' undeclared (first use in this function) if(a1 < 30) ^~ prog.c:7:14: error: expected ')' before ';' token if(a1 < 30) ^ prog.c:8:9: error: implicit declaration of function 'printf' [-Werror=implicit-function-declaration] printf("Cost: %.2f\n",(a1*0.6)+10); ^~~~~~ prog.c:8:9: error: incompatible implicit declaration of built-in function 'printf' [-Werror] prog.c:8:9: note: include '' or provide a declaration of 'printf' prog.c:10:17: error: 'gt' undeclared (first use in this function) else if(a1 > 30&&a1 < 50) ^~ prog.c:10:19: error: expected ')' before ';' token else if(a1 > 30&&a1 < 50) ^ prog.c:11:9: error: incompatible implicit declaration of built-in function 'printf' [-Werror] printf("Cost: %.2f\n",(30 * 0.6+(a1-30)*0.8)+10); ^~~~~~ prog.c:11:9: note: include '' or provide a declaration of 'printf' prog.c:13:19: error: expected ')' before ';' token else if(a1 > 50&&a1 < 60) ^ prog.c:14:9: error: incompatible implicit declaration of built-in function 'printf' [-Werror] printf("Cost: %.2f\n",(30 * 0.6) + (20 *0.8)+(a1 - 60)*1+10); ^~~~~~ prog.c:14:9: note: include '' or provide a declaration of 'printf' prog.c:16:19: error: expected ')' before ';' token else if(a1 > 60) ^ prog.c:17:13: error: incompatible implicit declaration of built-in function 'printf' [-Werror] printf("Cost: %.2f\n",(20 *0.8)+(30 *0.6)+10+(a1 - 60)*1.2+10); ^~~~~~ prog.c:17:13: note: include '' or provide a declaration of 'printf' prog.c:18:1: error: implicit declaration of function 'system' [-Werror=implicit-function-declaration] system("pause"); ^~~~~~ cc1: all warnings being treated as errors
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answered by (-141 points)
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prog.c:1:9: error: #include expects "FILENAME" or #include ^ prog.c: In function 'main': prog.c:6:5: error: implicit declaration of function 'scanf' [-Werror=implicit-function-declaration] scanf("%d",&a1); ^~~~~ prog.c:6:5: error: incompatible implicit declaration of built-in function 'scanf' [-Werror] prog.c:6:5: note: include '' or provide a declaration of 'scanf' prog.c:6:17: error: 'amp' undeclared (first use in this function) scanf("%d",&a1); ^~~ prog.c:6:17: note: each undeclared identifier is reported only once for each function it appears in prog.c:6:20: error: expected ')' before ';' token scanf("%d",&a1); ^ prog.c:7:12: error: 'lt' undeclared (first use in this function) if(a1 < 30) ^~ prog.c:7:14: error: expected ')' before ';' token if(a1 < 30) ^ prog.c:8:9: error: implicit declaration of function 'printf' [-Werror=implicit-function-declaration] printf("cost: %.2f\n",(a1*0.6)+10); ^~~~~~ prog.c:8:9: error: incompatible implicit declaration of built-in function 'printf' [-Werror] prog.c:8:9: note: include '' or provide a declaration of 'printf' prog.c:10:17: error: 'gt' undeclared (first use in this function) else if(a1 > 30&&a1 < 50) ^~ prog.c:10:19: error: expected ')' before ';' token else if(a1 > 30&&a1 < 50) ^ prog.c:11:9: error: incompatible implicit declaration of built-in function 'printf' [-Werror] printf("cost: %.2f\n",(30 * 0.6+(a1-30)*0.8)+10); ^~~~~~ prog.c:11:9: note: include '' or provide a declaration of 'printf' prog.c:13:19: error: expected ')' before ';' token else if(a1 > 50&&a1 < 60) ^ prog.c:14:9: error: incompatible implicit declaration of built-in function 'printf' [-Werror] printf("cost: %.2f\n",(30 * 0.6) + (20 *0.8)+(a1 - 60)*1+10); ^~~~~~ prog.c:14:9: note: include '' or provide a declaration of 'printf' prog.c:16:19: error: expected ')' before ';' token else if(a1 > 60) ^ prog.c:17:13: error: incompatible implicit declaration of built-in function 'printf' [-Werror] printf("cost: %.2f\n",(20 *0.8)+(30 *0.6)+10+(a1 - 60)*1.2+10); ^~~~~~ prog.c:17:13: note: include '' or provide a declaration of 'printf' prog.c:18:1: error: implicit declaration of function 'system' [-Werror=implicit-function-declaration] system("pause"); ^~~~~~ cc1: all warnings being treated as errors
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answered by (-141 points)
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prog.c:1:9: error: #include expects "FILENAME" or #include ^ prog.c: In function 'main': prog.c:9:5: error: implicit declaration of function 'scanf' [-Werror=implicit-function-declaration] scanf("%d",&a1); ^~~~~ prog.c:9:5: error: incompatible implicit declaration of built-in function 'scanf' [-Werror] prog.c:9:5: note: include '' or provide a declaration of 'scanf' prog.c:9:17: error: 'amp' undeclared (first use in this function) scanf("%d",&a1); ^~~ prog.c:9:17: note: each undeclared identifier is reported only once for each function it appears in prog.c:9:20: error: expected ')' before ';' token scanf("%d",&a1); ^ prog.c:10:12: error: 'lt' undeclared (first use in this function) if(a1 < 30) ^~ prog.c:10:14: error: expected ')' before ';' token if(a1 < 30) ^ prog.c:11:9: error: implicit declaration of function 'printf' [-Werror=implicit-function-declaration] printf("Cost: %.2f",(a1*0.6)+n); ^~~~~~ prog.c:11:9: error: incompatible implicit declaration of built-in function 'printf' [-Werror] prog.c:11:9: note: include '' or provide a declaration of 'printf' prog.c:13:17: error: 'gt' undeclared (first use in this function) else if(a1 > 30&&a1 < 50) ^~ prog.c:13:19: error: expected ')' before ';' token else if(a1 > 30&&a1 < 50) ^ prog.c:14:9: error: incompatible implicit declaration of built-in function 'printf' [-Werror] printf("Cost: %.2f",(x+(a1-30)*0.8)+n); ^~~~~~ prog.c:14:9: note: include '' or provide a declaration of 'printf' prog.c:16:19: error: expected ')' before ';' token else if(a1 > 50&&a1 < 60) ^ prog.c:17:9: error: incompatible implicit declaration of built-in function 'printf' [-Werror] printf("Cost: %.2f",x + y+(a1 - 60)*1+n); ^~~~~~ prog.c:17:9: note: include '' or provide a declaration of 'printf' prog.c:19:19: error: expected ')' before ';' token else if(a1 > 60) ^ prog.c:20:13: error: incompatible implicit declaration of built-in function 'printf' [-Werror] printf("Cost: %.2f",z+(a1 - 60)*1.2+n); ^~~~~~ prog.c:20:13: note: include '' or provide a declaration of 'printf' cc1: all warnings being treated as errors
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answered by (-141 points)
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prog.c:1:9: error: #include expects "FILENAME" or #include ^ prog.c: In function 'main': prog.c:9:5: error: implicit declaration of function 'scanf' [-Werror=implicit-function-declaration] scanf("%d",&a1); ^~~~~ prog.c:9:5: error: incompatible implicit declaration of built-in function 'scanf' [-Werror] prog.c:9:5: note: include '' or provide a declaration of 'scanf' prog.c:9:17: error: 'amp' undeclared (first use in this function) scanf("%d",&a1); ^~~ prog.c:9:17: note: each undeclared identifier is reported only once for each function it appears in prog.c:9:20: error: expected ')' before ';' token scanf("%d",&a1); ^ prog.c:10:12: error: 'lt' undeclared (first use in this function) if(a1 < 30) ^~ prog.c:10:14: error: expected ')' before ';' token if(a1 < 30) ^ prog.c:11:9: error: implicit declaration of function 'printf' [-Werror=implicit-function-declaration] printf("cost: %.2f",(a1*0.6)+n); ^~~~~~ prog.c:11:9: error: incompatible implicit declaration of built-in function 'printf' [-Werror] prog.c:11:9: note: include '' or provide a declaration of 'printf' prog.c:13:17: error: 'gt' undeclared (first use in this function) else if(a1 > 30&&a1 < 50) ^~ prog.c:13:19: error: expected ')' before ';' token else if(a1 > 30&&a1 < 50) ^ prog.c:14:9: error: incompatible implicit declaration of built-in function 'printf' [-Werror] printf("cost: %.2f",(x+(a1-30)*0.8)+n); ^~~~~~ prog.c:14:9: note: include '' or provide a declaration of 'printf' prog.c:16:19: error: expected ')' before ';' token else if(a1 > 50&&a1 < 60) ^ prog.c:17:9: error: incompatible implicit declaration of built-in function 'printf' [-Werror] printf("cost: %.2f",x + y+(a1 - 60)*1+n); ^~~~~~ prog.c:17:9: note: include '' or provide a declaration of 'printf' prog.c:19:19: error: expected ')' before ';' token else if(a1 > 60) ^ prog.c:20:13: error: incompatible implicit declaration of built-in function 'printf' [-Werror] printf("cost: %.2f",z+(a1 - 60)*1.2+n); ^~~~~~ prog.c:20:13: note: include '' or provide a declaration of 'printf' cc1: all warnings being treated as errors
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#include * *** **  **
int main(void)
{

int cm;
float cost;

 *   *   *   * ***    * *   *  

if  * *  *
{
*   *  **** **      *  ** *   ****   ** * ** ****  **
}

if     * *     ***  **** ***  ***    * 
{

* **   *   **    *** *    ***   ** * **** * 
}

  *    *  ********       **  **   ***  **
* ****** 
*  *    *   **  ** * **  **  ** ***   * **    *** * * **
 }


if (cm>0   ***** **      * *
   *  *  *     * * ******
*  * * ****  *****     * ** * *   * *** *** *  *  **  **  ****  
  *** ****  ***    **    ** *
**  *  ****       * cost);



return 0;
}
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Case 4: Wrong output
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