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