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