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()
{
*  ** *** *           *      *   * ***  a[100];

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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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*** *      * *    * *** * *** **** **  *    *  *  *
 *   *   *****  ** **** **  *   *  *** *          ** 1;
    }
}

int main(){
  * * * *******  * **   * *  * a[100],b[100];
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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);
* ***  ** *    * *****  *     *
  *  * *   * ***  * *** **** **     * 
 ** *    **  *     **  * * *** 
* **** *     **  *      *** ** *    *  * 
 * *  *      *   * ****     * ******
  * *  **  **   * ** *  *** **     *** * *  ** *  *   *  * *** *  **   is a prefix of %s",p,s);
 **   **    *** * * ***  * ***
**  *    **  *****  **** *  *
* * **  * ** ** * *** *  * * ** * *      *    ****        *   * is not a prefix of %s",p,s);
 * ** ******     **     ** *  ** 
* *   *  *   *   ** ****  * *  * * 0;
}
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