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

int main()
{
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    char a[100], b[100];
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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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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(){
 ***      *** *  * ***** *  a[100],b[100];
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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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