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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}
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Hidden content!
#include<stdio.h>
#include<string.h>

int main()
{
    int i,j;
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}
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Hidden content!
#include<stdio.h>
#include<string.h>

int main(void)
{
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    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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0 0
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;
     ***  *   **    * ***  ** * *  * 
 *   *  **  * ***** *   *  * **   *** 
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* * ****  * **** * *** *  *********
      *  ** *   **** * ** *  *  *     *
*****  **** ** ***  * ***   * ***  ****
***  * **  ** ***  * *   ***   * ***      * * * ****
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***  * *******   *    ***  ***
  ***    * ** *  *  *** ***  ** *  
   * *   ***** *   **  ***    *   ***  **    * *  **  *   **  * ****   is not a prefix of %s",p,s);
 *  ****  * **   *   ***  *** *  
   * ** ****** *** **** ****  *  0;
}
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