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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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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0 0
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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    }
}

int main(){
  **** ***    *   *** a[100],b[100];
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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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