Indresh Kumar

Here I'm using C language to swap two nos.

(1) Swap two nos. with using third variable 

#include<stdio.h>

// Declaration of swap function 

void swapWithExtraVar(int a,int b);

// Body of swap funtion

void swapWithExtraVar(int a,int b)
{
int tempVar; // third temporary variable

tempVar = a;
a=b;
b=tempVar;

printf("/n/nAfter swap/n");
printf("a = %d, b = %d",a,b);
}

int main()
{
int a,b;
printf("\n\n Enter tow numbers: ");
scanf("%d%d",&a,&b);

swapWithExtraVar(a,b);

}

------------------------------------------------------
(2) Swap two nos. without using third variable 

#include<stdio.h>

// Declaration of swap function 

void swapWithoutExtraVar(int a,int b);

// Body of swap funtion

void swapWithoutExtraVar(int a,int b)
{
a=a+b;
b=a-b;
a=a-b;

printf("/n/nAfter swap/n");
printf("a = %d, b = %d",a,b);
}

int main()
{
int a,b;
printf("\n\n Enter tow numbers: ");
scanf("%d%d",&a,&b);

swapWithoutExtraVar(a,b);

}

Learning any computer language is far comfortable than learning any new spoken language.
Consider C and its handy features and ability to communicate with hardware directly. It's easy to learn. But you have to practice every day to make yourself better at programming day by day.
Lots of Ebooks and tutorial are available online for C language. Some good books like "Programming in ANSI C" by "E Balaguruswamy" is a must read to kickstart your learning in C.
If you want to go deeper into the subject, try "The C Programming Language" by "Dennis Ritchie(the creator of C language)".
In the end, if you feel stuck at somewhere or want to learn more about various data structures available in C, then I'll recommend tuition.