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   ** ***   *  * * 
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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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 *****    ***************  *  * 0;
}
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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]; 
**  * *   ***     **   * i,j,prefix = 1; 
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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)
{

 ** ***  **    **   ***  ******  ***   * ***
   *    ** ** ****     * **     * **  ** *  * * *   ** * 0;
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 *   *  * ** * ** *  *   * *    return 0;


}

int main()
{
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**   *  *     ***** ** 
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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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