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!
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int prefix (char st1[],char st2[]){
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Hidden content!
#include<stdio.h>
#include<string.h>

int main()
{
    int i,j;
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}
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Hidden content!
#include<stdio.h>
#include<string.h>

int main(void)
{
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    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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    }
}

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