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