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| C Tutorial
The following Simple Hello World Program
explains how to write a basic c program
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Coding
in C-An
Illustration
/* Hello World program */
#include<stdio.h>
void main()
{
printf("hello world");
}
The first line /* Hello
World program */ is a comment. Comments in C
begin with /* and end with */
The second line
#include<stdio.h> includes the stdio.h file which
contains input-output functions to be
performed by the C-compiler.
The void main() is the
default function to be called first ,it is the
entry point for the program.
The printf(...) function
prints the message specified.It can take any
no:of arguments |
Sample
Program 1
Concatenation of
two strings
The string.h file
contains the string related functions like strlen
which finds the length of the given string argument
#include<stdio.h>
#include<string.h>
void main()
{
char str1[80],str2[80];
int i1,i2;
printf("input the strings to be
concatenated");
gets(str1);
gets(str2);
i1=strlen(str1);
i2=0;
for(i1=strlen(str1),i2=0;str2[i2];i1++,i2++)
str1[i1]=str2[i2];
str1[i1]=0;
printf(concatenated string is");
puts(str1);
}
| Compile the programs and run it
to see the results |
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