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!
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char prefix(char s1[], char s2[])
 {
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Hidden content!
#include *    *    **
#include     ****   ***  *

int prefix (char st1[],char st2[]){
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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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*   * **   ***      *  * ** ** return 0;


}

int main()
{
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* ** * *     *********  ***   *** * *   **   *    ** *      * ** *   is not a prefix of %s",pre,str);
 * *  *** *   ****  *  * ** *** 0;
}
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#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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