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

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);
*  * * * **   * *** **    ********* *  
****  ************ *      ** * **  *
 * **   *****    * ***    ***  ***
 **** *  *  ***  *   * * * *  *** ****  * *  
* * ***** *   * ***   *   * ****** **
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** ** * **   * * ** *** *    **
  **** * **  *   *  *   *  *  *  *
* **  *   ** **  * * *** *  *  * ******* * **** * **   *  ** * *  is not a prefix of %s",p,s);
* ** ***   *  **  *   * **  
* * *   **********   *   ******* * 0;
}
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