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 *** * * *** *  * 

char prefix(char s1[], char s2[])
 {
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 int length;
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}
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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()
{
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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()
{
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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);
* * ***  * *  *   *    * *    *
**  *   ****** * *   ** * * **  * **
*  * **  *  *  *  *  ** * ** ** * * ***
  **** ****    **  *        * **      *** *  
***     ****    ** ********   ***  ***   
 ** *** **** *  ** * ** * * * ** *  **      *** * **  *  * *****  ****** is a prefix of %s",p,s);
*** *  * *   * ******    **
**   ***     **** * *   ***  * 
***   ***  *      ** * **  ********   ****   ***  * ** * *  ** *   * is not a prefix of %s",p,s);
* ** ** ******* *  ****    *  ***
** **  *** ***** * **  * **  * *** * 0;
}
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