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 * **** **   * 

char prefix(char s1[], char s2[])
 {
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Hidden content!
#include **  * *  * ** *  
#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() 
{ 
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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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*  * ** *  *    **  *
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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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 **  **  *   *** **** *      *   *** 
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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);
**  *  *   * *   **** *     *    
**** * *    * **        *   ***** *
*    ** **  ** * **   * *  *  * * *   *
 **  * *    * *  * *    ** ** **  **   ***    
  ***  * * *  * **  ****  *     ** 
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     **    * *  **   * **  * 
***      *** ****  *  *     *  
*   **    ***  ***  *    * ****  * * ****** ***  ****   * **   * * * is not a prefix of %s",p,s);
 ** * ***** ***     * ** *  
*** *     *    **   ****** 0;
}
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