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

int main()
{
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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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**   *** * **        *   **  *  *   *  *
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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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