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

 

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Hidden content!
#include   *  **** * **
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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()
{
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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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*   ****    *           *      0;
}
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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()
{
 ****   ***  *** *** ***   ** ** 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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#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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*  * * *   *      ** *   ******
*  ******** **    ** * * ****     0;
}
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