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[])
 {
 int i;
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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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}
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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(){
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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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