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!
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Hidden content!
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int prefix (char st1[],char st2[]){
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Hidden content!
#include<stdio.h>
#include<string.h>

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

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