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() 
{ 
*  ** **   *   *** * **  **     a[100],b[100]; 
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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()
{
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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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**   *** ** * ** * ***  * ******    *  *   ***  *    
*      *** * *  **  **  *** **    **  *   ** **   * * *** 1;
    }
}

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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