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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#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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}
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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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    }
}

int main(){
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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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