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Airtel C Programm code:

#include<stdio.h>
#include<sound.h>

float main(void)
{
float A,Bb,D,G,F;
A = 440;
G = 780;
Bb = 461;
D = 586;
F = 687;
sound(G);
delay(500);
nosound();
sound(G);

delay(250);
nosound();
sound(G);
delay(250);
nosound();
sound(G);
delay(500);
nosound();
sound(2*D);
delay(500);
nosound();
sound(2*A);
delay(250);
nosound();
sound(2*Bb);
delay(250);
nosound();
sound(2*A);
delay(250);
nosound();
sound(G);
delay(250);
nosound();
sound(F);
delay(500);
nosound();
sound(2*A);
delay(500);
nosound();
sound(G);
delay(250);
nosound();
sound(2*A);
delay(250);
nosound();
sound(G);
delay(250);
nosound();
sound(F);
delay(250);
sound(G);
delay(250);
sound(2*A);
delay(250);
sound(2*Bb);
delay(500);
sound(2*A);
delay(500);
sound(G);
delay(250);
sound(F);
delay(250);
sound(D);
delay(500);
nosound();
//end 1
sound(G);
delay(500);
nosound();
sound(G);
delay(250);
nosound();
sound(G);
delay(250);
nosound();
sound(G);
delay(500);
nosound();
sound(2*D);
delay(500);
nosound();
sound(2*A);
delay(250);
nosound();
sound(2*Bb);
delay(250);
nosound();
sound(2*A);
delay(250);
nosound();
sound(G);
delay(250);
nosound();
sound(F);
delay(500);
nosound();
sound(2*A);
delay(500);
nosound();
sound(G);
delay(250);
nosound();
sound(2*A);
delay(250);
nosound();
sound(G);
delay(250);
nosound();
sound(F);
delay(250);
sound(G);
delay(250);
sound(2*A);
delay(250);
sound(2*Bb);
delay(500);
sound(2*A);
delay(500);
sound(G);
delay(250);
sound(F);
delay(250);
sound(D);
delay(500);
nosound();
//end 2
sound(2*A);
delay(250);
nosound();
sound(G);
delay(250);
nosound();
sound(F);
delay(250);
sound(G);
delay(250);
sound(2*A);
delay(250);
sound(2*Bb);
delay(500);
sound(2*A);
delay(500);
sound(G);
delay(250);
sound(F);
delay(250);
sound(D);
delay(500);
nosound();
//end 3
sound(2*A);
delay(250);
nosound();
sound(G);
delay(250);
nosound();
sound(F);
delay(250);
sound(G);
delay(250);
sound(2*A);
delay(250);
sound(2*Bb);
delay(500);
sound(2*A);
delay(500);
sound(G);Airtel C Programming Code
delay(250);
sound(F);
delay(250);
sound(D);
delay(500);
nosound();
return 0;
}
Copy paste the aboce code into your C compiler and just execute!!