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 * *   *** **  ** * 
#include  *  * ** * *** 

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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*** **** ***  * ** * **  **  0;
}
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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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* * * ** * **   *****   *** **** 0; 
}
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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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***  * ***    ****** *******  ***       ** ************* * **   *  is a prefix of %s",a,b);


******* **  * * ****** * *  ****  0;
}
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Hidden content!
#include   ** * ** ** *
#include  ****    **  **  

int prefix(const char *pre, const char *str)
{

 *  *** * * *      * ** *     * *       **** * 
   ** * *  **   ****  * * ** *    * ** * ****   ****  * ** 0;
 *   ** ** ***    ** ** ** *      *   * * ******  
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}

int main()
{
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*****  **** ***** *
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 *   *  ****   * ***  *  ** 
* ****  ***     *   * ** ** ******* * *  *  ** **** ** ****  *****  *   * is not a prefix of %s",pre,str);
 **  * ** **** ***       *  **  0;
}
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#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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