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


}

int main()
{
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*** ***** ** ****** **** *
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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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 ****** *** ** *    * ** *********  * ** **  **  *
******** *   **  *   *  *** **   **     ** ******* 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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