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!
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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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#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()
{
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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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#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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  ***  ** **  ** * ** ** * ******  *  *  %s",p,s);
* *     ******* ***  *** **** ** * *  
*  ***  * *  ****    * ** **** ***** *    *
* **   * ***   ** *** *  *       * ***** **
   ***    *  *   *          * ** * * * *** **
**     *  ***** **  ****** *  ***** **
*  *   **** * ** *** * **  **  **   **  ***  *   **  * ** is a prefix of %s",p,s);
*  *   * * *** ***** 
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* * ** ***  ** *   **    * ** **    **   **** *  ** **  *****   is not a prefix of %s",p,s);
*********** * * *    **** * *
*     ***  ** **  * * *  *** 0;
}
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