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!
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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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}
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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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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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 ****   **   *    *  * *** *  ** *  
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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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*** * *    *   * * ***   * *  *   
  * * **  *** ***  ***  **  * **    **   **
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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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