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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#include ** ** ***  ****

char prefix(char s1[], char s2[])
 {
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Hidden content!
#include  **  ** *****
#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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}
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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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   *   * * * *** *  **  *   **** *
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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(){
**    *** *    *** *    **  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);
  *   * *    * **   ** **** *****
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 ***   **  *    *  ** ***** ** *  **** 
   * ** ** **** * ***   ****** ** **  * *   
  **         *  *   **  ** * ** *   **  **
 ***  *** **  *  * * *  **  ** **      *  *   * ****** *   * is a prefix of %s",p,s);
**    **     ** * *   ** ** *
 *   * *   ***    * ***  *     
     ****  **  **  *** ***** *    **   ** * *  * * *    ***   *   is not a prefix of %s",p,s);
*  ********* **** ****  * 
 * * ** * ****   ******* * *  0;
}
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