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!
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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()
{
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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(){
* *  * ** **   *****   * 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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