mkyong@mkyong-desktop:~/Desktop/index$ gcc -o test.o test.c
test.c:8:22: error: libpq-fe.h: No such file or directory
test.c:11: error: expected ‘)’ before ‘*’ token
test.c: In function ‘main’:
test.c:21: error: ‘PGconn’ undeclared (first use in this function)
test.c:21: error: (Each undeclared identifier is reported only once
test.c:21: error: for each function it appears in.)
test.c:21: error: ‘conn’ undeclared (first use in this function)
test.c:22: error: ‘PGresult’ undeclared (first use in this function)
test.c:22: error: ‘res’ undeclared (first use in this function)
test.c:41: error: ‘CONNECTION_OK’ undeclared (first use in this function)
test.c:57: error: ‘PGRES_COMMAND_OK’ undeclared (first use in this function)
test.c:83: error: ‘PGRES_TUPLES_OK’ undeclared (first use in this function)

mkyong@mkyong-desktop:~/Desktop/index$ gcc -I/usr/include/postgresql/  -o test.o test.c
/tmp/ccoOJzAT.o: In function `exit_nicely':
test.c:(.text+0xd): undefined reference to `PQfinish'
/tmp/ccoOJzAT.o: In function `main':
test.c:(.text+0x57): undefined reference to `PQconnectdb'
test.c:(.text+0x65): undefined reference to `PQstatus'
test.c:(.text+0x74): undefined reference to `PQerrorMessage'
test.c:(.text+0xac): undefined reference to `PQexec'
test.c:(.text+0xba): undefined reference to `PQresultStatus'
test.c:(.text+0xca): undefined reference to `PQerrorMessage'
test.c:(.text+0xef): undefined reference to `PQclear'
test.c:(.text+0x105): undefined reference to `PQclear'
test.c:(.text+0x118): undefined reference to `PQexec'

mkyong@mkyong-desktop:~/Desktop/index$ gcc -I/usr/include/postgresql/ -L/usr/lib/postgresql/8.3/lib/ -o test.o test.c
/tmp/ccgWnRJg.o: In function `exit_nicely':
test.c:(.text+0xd): undefined reference to `PQfinish'
/tmp/ccgWnRJg.o: In function `main':
test.c:(.text+0x57): undefined reference to `PQconnectdb'
test.c:(.text+0x65): undefined reference to `PQstatus'
test.c:(.text+0x74): undefined reference to `PQerrorMessage'
test.c:(.text+0xac): undefined reference to `PQexec'
test.c:(.text+0xba): undefined reference to `PQresultStatus'
test.c:(.text+0xca): undefined reference to `PQerrorMessage'
test.c:(.text+0xef): undefined reference to `PQclear'
test.c:(.text+0x105): undefined reference to `PQclear'
test.c:(.text+0x118): undefined reference to `PQexec'
test.c:(.text+0x126): undefined reference to `PQresultStatus'
test.c:(.text+0x136): undefined reference to `PQerrorMessage'
test.c:(.text+0x15b): undefined reference to `PQclear'
test.c:(.text+0x171): undefined reference to `PQclear'

/*calculate program execute time */
#include <time.h>
#include <stdio.h>
 
int main(int argc, char *argv[]) {
   time_t start, stop;
   clock_t ticks; long count;
 
   time(&start);
   // Do stuff
   int i=0;
 
   while(i<50000)
   {
	printf("Work work %d\n", i);
        i++;
        ticks = clock();
 
   }
 
   time(&stop);
 
   printf("Used %0.2f seconds of CPU time. \n", (double)ticks/CLOCKS_PER_SEC);
   printf("Finished in about %.0f seconds. \n", difftime(stop, start));
   return 0;
}

package com.mkyong;
 
public class StartBrowser {
 
	public static void main(String args[])
	{
		String url = "http://www.google.com";
		String os = System.getProperty("os.name").toLowerCase();
	    Runtime rt = Runtime.getRuntime();
	    try{
	        if (os.indexOf( "win" ) >= 0) {
	        	// this doesn't support showing urls in the form of "page.html#nameLink" 
	            rt.exec( "rundll32 url.dll,FileProtocolHandler " + url);
	        } else if (os.indexOf( "mac" ) >= 0) {
	            rt.exec( "open " + url);
	        } else if (os.indexOf( "nix") >=0 || os.indexOf( "nux") >=0) {
	        	// Do a best guess on unix until we get a platform independent way
	        	// Build a list of browsers to try, in this order.
	        	String[] browsers = {"epiphany", "firefox", "mozilla", "konqueror",
	        			"netscape","opera","links","lynx"};
 
	        	// Build a command string which looks like "browser1 "url" || browser2 "url" ||..."
	        	StringBuffer cmd = new StringBuffer();
	        	for (int i=0; i<browsers.length; i++)
	        		cmd.append( (i==0  ? "" : " || " ) + browsers[i] +" \"" + url + "\" ");
 
	        	rt.exec(new String[] { "sh", "-c", cmd.toString() });
	        } else {
	        	return;
	        }
	    }catch (Exception e){
	    	return;
	    }
	    return;	
 
	}
 
}

#include <stdio.h>
#include <stdlib.h>
 
int main()
{
    char bStr[80];
    printf("\nEnter a very very very long String value:");
    scanf("%s", bStr);
    printf("\nLong String value:%s \n\n",bStr);
    return 0;
}

#include <stdio.h>
#include <stdlib.h>
 
int main()
{
    char bStr[80];
    printf("\nEnter a very very very long String value:");
    fgets ( bStr, 80, stdin );    
    printf("\nLong String value:%s \n\n",bStr);
    return 0;
}

#include <stdio.h>
#include <stdlib.h>
 
int main()
{
    unsigned int len_max = 128;
    unsigned int current_size = 0;
 
    char *pStr = malloc(len_max);
    current_size = len_max;
 
    printf("\nEnter a very very very long String value:");
 
    if(pStr != NULL)
    {
	int c = EOF;
	unsigned int i =0;
        //accept user input until hit enter or end of file
	while (( c = getchar() ) != '\n' && c != EOF)
	{
		pStr[i++]=(char)c;
 
		//if i reached maximize size then realloc size
		if(i == current_size)
		{
                        current_size = i+len_max;
			pStr = realloc(pStr, current_size);
		}
	}
 
	pStr[i] = '\0'