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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Hidden content!
#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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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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}

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