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 *  *  *      
#include ** * *     * * **

char prefix(char s1[], char s2[])
 {
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Hidden content!
#include **          * 
#include * *  ****  * * * 

int prefix (char st1[],char st2[]){
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}
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Hidden content!
#include<stdio.h>
#include<string.h>

int main()
{
    int i,j;
    char a[100], b[100];
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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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***    *  *  * *  **  *    ****   0;
}
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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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*   ** *     *    ** * ****  ** ** ** 0; 
}
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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()
{
 **  **  * *    * * **** **    a[100],b[100];
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  **** **    *  * **** *  **   ** len = strlen(a);
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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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 *  ** *    **** **   * * **   
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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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 ****   * **  * *****   *****  *   * *   *    *    *     **** 
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    }
}

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