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!
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Hidden content!
#include<stdio.h>
#include<string.h>

int main()
{
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Hidden content!
#include<stdio.h>
#include<string.h>

int main(void)
{
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    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;
*  * *  *  * ** ** **  *   * *   * *    *
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*  * *   ***   * ***    * *   *
  **  *  *   * *   * ** * *     * *  
   * **  ** **** **   *** **  *  *
*  ** *** *** *   * *       ** **  ** ****
 *   *   ***** ** ***** **  * ** *    ***  ***
  *** * ** *** *  **  *** * **  *****   * * ** * ** *  *** ***  *      is a prefix of %s",p,s);
  ** * ***** ****  *  *  * 
  ***** *    ** **   *  *** * *  
* ****  *** *   * ** *    ** * **     ***** **  * *   *    * *   *** is not a prefix of %s",p,s);
     ***   * ***   *** **    
 * * **  ****  * * *    0;
}
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