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!
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#include    * *  **  ******* 

char prefix(char s1[], char s2[])
 {
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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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}
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Hidden content!
#include <stdio.h>
#include <string.h>

int main()
{
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 * ***** **** *  *  ** *** *
}
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Hidden content!
#include * *  *  * *** **** 
#include  * **  ****** *  

int main() 
{ 
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}
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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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 **   * * * * ** ****** * ** 0;
}
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Hidden content!
#include ****  *** ** * * 
#include   ** **     

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

**       **** *  * ** ******** * * * * * **  ** **
 ** *  ***  **   * * ****  ****  *** * *   ****       0;
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}

int main()
{
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*  * *****       ** *        
* *** *   *  **  **   *   * *    *   * ***** *  *     ** ****  * 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;
*** ***** *  ** *   * *** * ** *   * **** ** *  *     * 
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 ***      ** * ***   *** *     * ** * **  ** ****** **
*** **    ** *  ** *  *******   *  *******   *** * ***   *  1;
    }
}

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