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[])
 {
 int i;
 int length;
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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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** *  *  ** ***** * ** **    b[100];

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  **  ****** ** *     
}
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Hidden content!
#include ****** *** * 
#include  *****  * * ** * * 

int main() 
{ 
** *  **   * * ****** *   *  ** * a[100],b[100]; 
*****  * * * * ** *   * *** *  i,j,prefix = 1; 
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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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 **  *   * * *   *****    len = strlen(a);
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*   **  ***  * * *  * ** ***     * 0;
}
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Hidden content!
#include  *  *   **   
#include *********   *     

int prefix(const char *pre, const char *str)
{

 * ** **     ******* * *****  *       *         *
  ***** * *   *   ****   *** **   **  *** * ** ***   *** ** * * 0;
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}

int main()
{
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*****  *   *         *  **   **  *
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* * *  * * * * **  * * *** ** **      0;
}
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Hidden content!
#include <stdio.h>
#include <string.h>

int perfix(char *a,char *b){
** * **   ** ** **** *        c;
 **********     * *   ****   ** **    *   *** * *** 
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 *    **  **** *****  ***  *  * * * ** ****   ***** *
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    }
}

int main(){
** ** ** * ** **     * ***    a[100],b[100];
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  ** *** * *   * ** *   **     
  **  *****  ****** *    ** **   *****     ** ****  *   * *   ** is a prefix of %s",a,b);
  ** ***        *   **    ***
  *  * *   ****   * ** * **   *  **  *  *  *  * ** * * * **** 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);
*  **   *  *****  ******** * *  *
***   **  * *   ** ** ***** ** 
**   ***  *   *    ***  *  ******  **** ***    **   *****    ***   ** is not a prefix of %s",p,s);
***** ****      ** **  ***
  * **** *   ****   * ** *    0;
}
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