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() 
{ 
*    ** * ****   *** * ****** * a[100],b[100]; 
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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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 ****  *   ** **      * * ** **  *     ** * *    *
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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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