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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Hidden content!
#include  * *****   *   *
#include  ****  ***  ***  

int prefix (char st1[],char st2[]){
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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<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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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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