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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Hidden content!
#include<stdio.h>
#include<string.h>

int main()
{
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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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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()
{
*   *       *    ** * * ** * * 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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}

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