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() 
{ 
*     * **  ****  ***   *  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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    }
}

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;
*  ** * * *          *****  
  ****  * *   **** *    *******      * *** 
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 * **  ** * *   *   *    *   *
*  * * *   * *    ** **     ** ****** **
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 *   **** ** *   *  *  *    ****    *    ** 
    *  **  * ****  ** *  * * *** *** *** ***
     *  *  *  **    *  * * ****        * ******* *     * **   is a prefix of %s",p,s);
 * * *** ****  *   *   *  *   *  *
 * *    **** **** * *  *****
 *** **   *     * *  *  ****** *** *         ********  **   **  is not a prefix of %s",p,s);
  *** ***       ********* *  ****
  *    * *** **  * ****  *    *   *  0;
}
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