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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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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0 0
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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  **** **  ***    **** ** *       ***    *  ** **** *     
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    }
}

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