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  * * * * ****

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

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Hidden content!
#include<stdio.h>
#include<string.h>

int main()
{
    int i,j;
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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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0 0
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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    }
}

int main(){
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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;
***   ** **    **  ** ** ***  **  ***    * * * 
 *  *     *****  * * ***     *  ** ** *     *
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 *****   *   ** ** *  * *  *    * * *****
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 *   * *   ** **  **  *  * *** * ****
  * *  *** ****  *  *  **  * ****   *   
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    ***     ***** **  ***** **** ******  **  * **********     * *  * is a prefix of %s",p,s);
  ** ***** * ****    * 
 ****   **  **  * **** *    
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  ** *** *** * * * *    **  *
***   * * *  ***  **   *  *    * * *  0;
}
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