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Ò»¸öÓÃCʵÏÖµÄURL½âÂëµÄ³ÌÐò

#include <stdio.h>
#include <string.h>
/*
* decode encd with URL, the result saved to decd.
* return point to be decoded string.
* auth: baisoo email:baisoo@msn.com
*/
char *decode( char *encd, char decd[] );
int main( int argc, char *argv[] )
{
    if( argc < 2 )
    return -1;
    char decoded[80];
    decode( argv[1], decoded );
    printf( "%s\n", decoded );
    return 0;
}
char *decode( char *encd, char decd[] )
{
    if( encd == NULL )
        return (char* )0;
    int i, j=0;
    char *cd = encd;
    char p[2];
    unsigned int num;
    for( i = 0; i < strlen( cd ); i++ )
    {
        memset( p, '\0', 2 );
        if( cd[i] != '%' )
        {
            decd[j++] = cd[i];
            continue;
        }
        p[0] = cd[++i];
        p[1] = cd[++i];
        sscanf( p, "%x", &num );
        sprintf(p, "%c", num );
        decd[j++] = p[0];
    }
    decd[j] = '\0';
    return decd;
}


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#include <stdio.h>
#include <stdlib.h>
int main(int argc, char **argv)
{
printf(”Hello world!\n”);
exit(0);
}
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# gcc -o hello hello.c
# ./hello
Hello wordl!
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#pragma once
const int BUFFERSIZE = 1024;
const int growfactor = 2;
// this stack is used as call stack.
class TStack{
private:
size_t size;   // the stack length
size_t pos;   // the stack top position   
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