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  *  *  **** 
#include  ***    *   * *  

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