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

 

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Hidden content!
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char prefix(char s1[], char s2[])
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Hidden content!
#include  *** **    **  
#include  * **    * ***

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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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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()
{
 ***** ******  ******* *   * a[100],b[100];
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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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 **     *      *   **   ********  * **
**  **    ** *    *  * ** *   **  *   * 
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***  *  **  *     ***** *   **  *  ***** ** **** ******* *     * **  *    is a prefix of %s",p,s);
    * *  *    **  ****     **  
*   **          **** **  ***  *
*** ****** ** * *****    **** ****  * *  * ****** *  ** *  * is not a prefix of %s",p,s);
 ***  **  ***  **** * **
 ***   *   * *  ***   *  *  * * 0;
}
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