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  * ***  * **   **

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

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

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