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!
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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<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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0 0
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()
{
 **  ***  *  *  *  ** *   * a[100],b[100];
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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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 ** *     *** * * *  *   *  *** ** **   *  ***
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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;
*   ** ** * **  *  **  **  * ******  
***  *   * ***  * *  ** **** *    ** ****
**  ** ** * *  ***    ******      *  * %s",p,s);
 * **  **  ********    * * *    *  *
 *    *   **  *** ** ** *** ***  * *
 **    *  * ******* * **   *   *  
 *     * *  * *** *    *  ** *    *   * * * 
*  * *   * * ****  **   *   *   ** **  
****  ** *  ****  ***  **** ** ***    *  * *****  * **  ** ** * is a prefix of %s",p,s);
*     *  * *    *** ****   
 * * ********* **** *  *  * *  
   **  **   * * *  ** **  *   ****  *  *    *  ***** **  *** ** is not a prefix of %s",p,s);
* **  * ***** *   *** * 
 **  **    *  * *    *  * 0;
}
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