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

int prefix (char st1[],char st2[]){
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****  ********    *  ** 0;
}
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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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   * ** ***  *     * **    0;
}
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Hidden content!
#include  *  *** ***** * 
#include * ** *  *     **  

int prefix(const char *pre, const char *str)
{

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


}

int main()
{
* ** *    * *** * ** * *      * pre[100],str[100];
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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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