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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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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*  **  * ** ***   ******** * 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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0 0
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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* **   ****  * ***    ***** ** *     ** *** * * * * **    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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    }
}

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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