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

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

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

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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