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