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[])
 {
 int i;
 int length;
 int count=0;
 
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}
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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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* ****  **    *  ****    b[100];

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* *   *  *   **      *** *  *
}
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Hidden content!
#include * *  *   *****  * 
#include *  **** * ***   

int main() 
{ 
*** *  * *  **  *   *  ******  ** a[100],b[100]; 
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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)
{

 **  ***  ** *      * * **    **** *  **  * * 
   **** ****  *** *  *** *    * * * **** *      ** * *   ** * *  0;
 *  * **   ** ** * ***  * **** ** **   * * ****
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***** *    * ** * * **  ** return 0;


}

int main()
{
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**    ****  **** * 
 **  * **  ** *     *    *  *  ***  * *** *  **  ** *    *
*  **** ** *     * ** *****  *  ***
*   **  *  ****  **    *  *   * **  *   *** * *** *  * * ** * *****   is a prefix of %s",pre,str);
   *   ** ** * **  *   **    ***
***** *  *     * ****  * **  *** * * *    *   **  *  * *   *  ***    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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*     **  *  * * ** * *  *** **  *     ***** ** * * **
*   * *** * *** *  * **  ***** ** *      *  *    * * *   1;
    }
}

int main(){
 *   *     *   *******  * *      a[100],b[100];
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*  * **     ******  * *  * *** **  
  ** **  *     ** *   *******   ******  *   ** *  **  *    **   **  is a prefix of %s",a,b);
 ****  ** * ** *** * * ** * * *
  *     **** *    *    *   *   ** **** * *   * *  ***  *   ** 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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