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