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!
#include   * *  **  
#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()
{
****    *    *    ** * **  a[100];

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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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  *  * * *  *  **   * **    * * 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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