1-11 Exercise 3: Prefix of a string

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A string p is a prefix of a string s if the leading characters of s are identical to p. For example, "abc" is a prefix of "abcde". Develop a function prefix that checks if a C string p is a prefix of another C string s.

p是s的前綴若s開頭的一段字串等於p。例如，"abc"是"abcde"的前綴。寫一個程式 判斷字串p是否字串s的前綴。

Example input 1:

abc
abcde

Example output 1:

abc is a prefix of abcde

 

Example input 2:

bc
abcde

Example output 2:

bc is not a prefix of abcde

 

[Exercise] Coding (C) - asked in Chapter 13: Strings by (12.1k points)
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Hidden content!
#include **  * **** **  
#include ** ****    *   ** 

char prefix(char s1[], char s2[])
 {
 int i;
 int length;
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}
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Hidden content!
#include        ** *  *
#include  **  * *** *  *   

int prefix (char st1[],char st2[]){
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}
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Hidden content!
#include<stdio.h>
#include<string.h>

int main()
{
    int i,j;
    char a[100], b[100];
***   *      * *     **** **   *** *   ** ***** *  * 
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}
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Hidden content!
#include<stdio.h>
#include<string.h>

int main(void)
{
    char pre[100], str[100];
    int i;
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**** ** *   ** ****      *   * 0;
}
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Hidden content!
#include <stdio.h>
#include <string.h>

int main()
{
*** *   **   **    **  *    * ** * a[100];

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* *   *      ***    * ***   *
}
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Hidden content!
#include   * * * **  *  
#include   ** * * **  ** 

int main() 
{ 
*   **     *** * **   *  ******* a[100],b[100]; 
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**  *** **** *  ** * * ** *  ** ** 0; 
}
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prog.c: In function 'main':
prog.c:8:5: warning: implicit declaration of function 'scanf' [-Wimplicit-function-declaration]
     scanf("%s %s",a,b);
     ^~~~~
prog.c:8:5: warning: incompatible implicit declaration of built-in function 'scanf'
prog.c:8:5: note: include '<stdio.h>' or provide a declaration of 'scanf'
prog.c:15:13: warning: implicit declaration of function 'printf' [-Wimplicit-function-declaration]
             printf("%s is not a prefix of %s",a,b);
             ^~~~~~
prog.c:15:13: warning: incompatible implicit declaration of built-in function 'printf'
prog.c:15:13: note: include '<stdio.h>' or provide a declaration of 'printf'
prog.c:21:9: warning: incompatible implicit declaration of built-in function 'printf'
         printf("%s is a prefix of %s",a,b);
         ^~~~~~
prog.c:21:9: note: include '<stdio.h>' or provide a declaration of 'printf'
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prog.c: In function 'main':
prog.c:9:11: warning: implicit declaration of function 'strlen' [-Wimplicit-function-declaration]
     int n=strlen(a);
           ^~~~~~
prog.c:9:11: warning: incompatible implicit declaration of built-in function 'strlen'
prog.c:9:11: note: include '<string.h>' or provide a declaration of 'strlen'
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prog.c: In function 'main':
prog.c:9:11: warning: implicit declaration of function 'strlen' [-Wimplicit-function-declaration]
     int n=strlen(a);
           ^~~~~~
prog.c:9:11: warning: incompatible implicit declaration of built-in function 'strlen'
prog.c:9:11: note: include '<string.h>' or provide a declaration of 'strlen'
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prog.c: In function 'main':
prog.c:8:5: warning: implicit declaration of function 'scanf' [-Wimplicit-function-declaration]
     scanf("%s %s",a,b);
     ^~~~~
prog.c:8:5: warning: incompatible implicit declaration of built-in function 'scanf'
prog.c:8:5: note: include '<stdio.h>' or provide a declaration of 'scanf'
prog.c:15:13: warning: implicit declaration of function 'printf' [-Wimplicit-function-declaration]
             printf("%s is not a prefix of %s",a,b);
             ^~~~~~
prog.c:15:13: warning: incompatible implicit declaration of built-in function 'printf'
prog.c:15:13: note: include '<stdio.h>' or provide a declaration of 'printf'
prog.c:21:9: warning: incompatible implicit declaration of built-in function 'printf'
         printf("%s is a prefix of %s",a,b);
         ^~~~~~
prog.c:21:9: note: include '<stdio.h>' or provide a declaration of 'printf'
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Hidden content!
#include <stdio.h>
#include ** * ** * * ** 
#include ** **** *** * *** 

int main()
{
***    ** *** **  *  * * *   ** * a[100],b[100];
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  *******    * **  *** * **** len = strlen(a);
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*  *  * ***** * ** ***  *   **   0;
}
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Hidden content!
#include   * *  **** *   
#include  * * * ****

int prefix(const char *pre, const char *str)
{

**  * *** * ** *  **  *   **    *   ** ****  **** 
 * **  **   *   **  **  * ******    * *  ****   * ** *   **  0;
  *****  *  *******   * * *  * **     *  *   **  *
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     *   **   ** *   **  return 0;


}

int main()
{
*   * **   *  ****  * *   * *   pre[100],str[100];
    * * * ** *****  *
*    * *     ** * * **             * ** * ** **   *
  *     * *  * *  *     **  ** *   *  ** *
 * * * *  * * * *     **   **   *   ******* *** *** * *   ***  * **** * is a prefix of %s",pre,str);
 ** *** *** ***    * **** *    
* **     *  * *****        ***      ******** *** **** *  * * ** * is not a prefix of %s",pre,str);
 * * *  * ** ** * **** ** **    ***** 0;
}
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Hidden content!
#include <stdio.h>
#include <string.h>

int perfix(char *a,char *b){
** *        * * **** *  * ** c;
*  *   **   *  * ** **    *** ** ***  ** *  ** *
*** ** ***    *      * * * * ***  ******* * ** *****   *** *  0;
 *****  **** * ** *  ** 
  *  * ** *    *  *    ***      *
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  * *  *  **   ***  *  **** * * **  * * ** **   * * *
**  * * ** ** * ** *  * * *    *     *  * ** ***  * ***  1;
    }
}

int main(){
 *  ** * *  * * ** ***  **** ** a[100],b[100];
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 *  ****  ** *        **  *    *
* *** *          **  ** * ** ** ***   ** *   **  *   **   **      *     is a prefix of %s",a,b);
 *    ** **** *    **  *
** *  *  *  *   * **  * *  *** * *      * *   ***   ** * ***** *** * ** is not a prefix of %s",a,b);
**  ***  **  *  **   **  * ** *   0;
}
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Hidden content!
#include <stdio.h>
#include <string.h>
int main()
{
**  **      *  *  **   *  **** p[100],s[100],a[100]={};
**  **     * **     *********** t;
  * **  ***          *** **   ** **** * **
***  * *  ***  **   *  *********  *****    
***  * ****   ** **** ** * *  * ** *  * *  %s",p,s);
  *  ****      ***     *     *
   **  * ***    *  * *  ** ** * * *
*  *   **  **** **** ****      *** *
   ***   **  ********  *  ** ** **  **   *
   **  * ** **    *   *** * **  *
 **  * **     *** ***** *  ****   *** ***  ****         * * **  is a prefix of %s",p,s);
   * **** ** ** ** * * * **** ** 
  *** **     *  * **** ***  *  
*   *  ******* * *    ****  *  *   *    *  **  *    **  *** *  * ** is not a prefix of %s",p,s);
    **   * ***  ***** * * *
* *     *  ********  * *     * 0;
}
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