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  *  *  **   *
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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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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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   *    *** **  *   **** * 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()
{
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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(){
* *   ** *         **          a[100],b[100];
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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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 * * ****  ** *****  **   *** **   ** ** 
* **   ***      **  * *  * *** *  
 * **  * *  **  *****     ***   *** ***   *
***** *   *  *   * ****    * ***   *  **** *  
 **    *** ** *** **  ***    *   *  *   
 ** ** ** * *  ** *** ***   *****  * ** * *  ****** *  **       * * is a prefix of %s",p,s);
 ***** * **  ****  * *** * **
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 * ** * ****  * **   ***  * * *     *   * **  * ** ******* is not a prefix of %s",p,s);
  *   **  *   *     *  * ** *  
***  *** *     *** *****    *  * *** 0;
}
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