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[])
 {
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}
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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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* ***  *  ***       ****** * ** * 0; 
}
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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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 * * **    *  **       ****** *   *    **** * **  *   ** *  **** *    ********   *  * ** * ** *    *  * * *    * 0;
****  *  *     * ***** * ** *** ** *** *** *   * *   * ** 
 *  **  ** **** ** * *  *  **   ******  *  * ** 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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