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!
#include *  *   ** *** *
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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()
{
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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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  **  ******  **    *** *     ****  * ** * *    *  * ** ****** **  *  ***  * 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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*      *    * * *   * ***  ** 
 *** * *** * * **    * * ** * *   ****  *** ***** * **    *    * *  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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