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