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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char prefix(char s1[], char s2[])
 {
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Hidden content!
#include  *    *  *  **  
#include ** ****   ** 

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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() 
{ 
* ****  ***    ***  *   *  * a[100],b[100]; 
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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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    }
}

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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