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 *  **** *  *** 
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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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}
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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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  * ** * ***  *** ***** *       ***  **   *** * ****** **   *      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 not a prefix of %s",p,s);
* * *** * ***  *     * *
   *** **        * ** **    * ** * *  *** 0;
}
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