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!
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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() 
{ 
* *  * ****     * ** ****    a[100],b[100]; 
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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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}

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(){
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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);
*** ** **        ***    
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* ** ***   * * ** ***  **  
 *   *    *  ** ** **** ***  ***  0;
}
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