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