# Lab-1

## Questions

### Question-1

```c
// Write a C program to add two integers a and b read through the keyboard.
// Display the result using third variable sum.

#include <stdio.h> // Preprocessor directive.

int main() // Start main.
{ // Start.

	int a, b, sum; // Variable initialisations.

	// Ask user for input.
	printf("Enter two numbers: \n");
	scanf("%d %d", &a, &b);

	sum = a + b; // Sum of values stored in variables a and b.

	// Display output.
	printf("The sum of %d and %d is %d.\n", a, b, sum);

	printf("\nMy name is Ashrith Sagar Yedlapalli.\n");

} // End.
```

### Question-2

```c
// Write a C program to find the sum, difference, product and quotient of 2 numbers.

#include <stdio.h> // Preprocessor directive.

int main() // Start main.
{ // Start.

	// Variable initialisations.
	int a, b, sum, diff, prod;
	float quot;

	// Ask user for input.
	printf("Enter two numbers: \n");
	scanf("%d %d", &a, &b);

	// Sum.
	sum = a + b;

	// Difference.
	if (a > b)
	{
		diff = a - b;
	}
	else
	{
		diff = b - a;
	}

	// Product.
	prod = a * b;

	// Quotient.
	quot = (float) a / b;

	// Display output.
	printf("The sum of %d and %d is %d.\n", a, b, sum);
	printf("The difference of %d and %d is %d.\n", a, b, diff);
	printf("The product of %d and %d is %d.\n", a, b, prod);
	printf("The quotient of %d and %d is %f.\n", a, b, quot);

	printf("\nMy name is Ashrith Sagar Yedlapalli.\n");

} // End.
```

### Question-3

```c
// Write a C program to print the ASCII value of a character.

#include <stdio.h> // Preprocessor directive.

int main() // Start main.
{ // Start.

	// Variable initialisations.
	char c;
	int ascii;

	// Ask user for input.
	printf("Enter a character: \n");
	scanf("%c", &c);

	ascii = (int) c;

	// Display output.
	printf("The ASCII value of %c is %d.\n", c, ascii);

	printf("\nMy name is Ashrith Sagar Yedlapalli.\n");

} // End.
```

### Question-4

```c
// Write a C program to display the size of the data type int, char,
// float, double, long int and long double using sizeof() operator.

#include <stdio.h> // Preprocessor directive.

int main() // Start main.
{ // Start.

	// Variable initialisations.
	int i;
	char c;
	float f;
	double d;
	long int li;
	long double ld;
	int S_i, S_c, S_f, S_d, S_li, S_ld;

	S_i = sizeof(i);
	S_c = sizeof(c);
	S_f = sizeof(f);
	S_d = sizeof(d);
	S_li = sizeof(li);
	S_ld = sizeof(ld);

	// Display output.
	printf("The size of data type int is %d.\n", S_i);
	printf("The size of data type char is %d.\n", S_c);
	printf("The size of data type float is %d.\n", S_f);
	printf("The size of data type double is %d.\n", S_d);
	printf("The size of data type long int is %d.\n", S_li);
	printf("The size of data type long double is %d.\n", S_ld);

	printf("\nMy name is Ashrith Sagar Yedlapalli.\n");

} // End.
```

### Question-5

```c
// Preprocessor directives.
#include <stdio.h>
#include <math.h>

int main() // Start main.
{ // Start.

	// Variable initialisations.
	float P, N, R;
	float SI, CI;
	
	// Ask user for input.
	printf("Enter P (in INR or USD), N (in years), R (in percentage per annum): \n");
	scanf("%f %f %f", &P, &N, &R);

	// Simple interest.
	SI = P*N*R / 100.0;

	// Compound interest.
	CI = P * pow( (1+R/100.0), N ) - P;

	// Display output.
	printf("The Simple interest is %f.\n", SI);
	printf("The Compound interest is %f.\n", CI);

	printf("\nMy name is Ashrith Sagar Yedlapalli.\n");

} // End.
```

### Question-6

```c
// Preprocessor directives.
#include <stdio.h>
#include <math.h>

int main() // Start main.
{ // Start.

	// Variable initialisations.
	const double pi = 3.14159265;
	int r;
	float Vol, SA;
	
	// Ask user for input.
	printf("Enter radius: \n");
	scanf("%d", &r);

	Vol = (4.0 * pi * pow(r, 3)) / 3.0;
	SA = 4.0 * pi * pow(r, 2);

	// Display output.
	printf("The Volume of the sphere is %f.\n", Vol);
	printf("The Surface Area of the sphere is %f.\n", SA);

	printf("\nMy name is Ashrith Sagar Yedlapalli.\n");

} // End.
```

### Question-7

```c
// Preprocessor directives.
#include <stdio.h>

int main() // Start main.
{ // Start.

	// Variable initialisations.
	float C, F;
	
	// Ask user for input.
	printf("Enter temperature in Fahrenheit: \n");
	scanf("%f", &F);

	C = (5.0/9) * (F - 32);

	// Display output.
	printf("The given temperature in Centigrade is %f C.\n", C);

	printf("\nMy name is Ashrith Sagar Yedlapalli.\n");

} // End.
```

### Question-8

```c
// Preprocessor directives.
#include <stdio.h>

int main() // Start main.
{ // Start.

	// Variable initialisations.
	int a, b, c, d;
	int A_1, A_2, A_3, A_4;
	
	// Ask user for input.
	printf("Enter a, b, c, d: \n");
	scanf("%d %d %d %d", &a, &b, &c, &d);

	A_1 = (a + b) * c / d;
	A_2 = ((a + b) * c) / d;
	A_3 = a + (b * c) / d;
	A_4 = (a + b) * (c / d);

	// Display output.
	printf("(a+b)*c/d = %d\n", A_1);
	printf("((a+b)*c)/d = %d\n", A_2);
	printf("a+(b*c)/d = %d\n", A_3);
	printf("(a+b)*(c/d) = %d\n", A_4);

	printf("\nMy name is Ashrith Sagar Yedlapalli.\n");

} // End.
```


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