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[])
 {
 int i;
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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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}
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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()
{
 *   *   **  ** *** * * ** ***   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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**    *****     * *** **   **  *** ******  **
**** ** ** ****  *** *  * * * **   *  *   ***  *  * ****  1;
    }
}

int main(){
  **** **    *  *****    * ** a[100],b[100];
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 * * *  **** *  **  * *  *   ** *      
   *     *  ****     **  **  ** *        * * * **    *  *  ** ** ******   is a prefix of %s",a,b);
          *   * * *  **  *  *
 *     * *** ** * *   ** * ** ***  *** * *  ** *  ****  *     ***** 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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