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

 

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