Add Day 1 and Day 2 programs

Author: sahilbansal17

.gitignore

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+*.DS_Store
+*.out

Day 1/add.c

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+/*
+ * Program to add two numbers
+ */
+
+#include <stdio.h>
+
+int add(int first, int second) {
+	return first + second;
+}
+
+int main () {
+
+	int firstNumber;
+	int secondNumber;
+
+	printf("Please enter the first number: ");
+	scanf("%d", &firstNumber);
+
+	printf("Please enter the second number: ");
+	scanf("%d", &secondNumber);
+
+	int result = add(firstNumber, secondNumber);
+	printf("Sum of two numbers is: %d\n", result);
+	return 0;
+}

Day 1/hello.c

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+/*
+ * This is our first program.
+ * It will print hello world to the screen.
+ */
+
+#include <stdio.h>
+#include <math.h>
+
+int main () {
+
+	int firstVariable = - pow(2, 31);
+	// firstVariable = 2;
+
+	printf("Value of the variable is: %d\n", firstVariable);
+
+	// integer can store 4 bytes = 32 bits
+	// it can store 2^32 values!!!
+
+	// but they also can store negative numbers
+	// -(2^31) to (2^31 - 1)
+
+	// 1 byte = 8 bits
+	// every bit = either 0 or 1
+	// how many possible bit combinations we have
+	// for 32 bits?
+
+	// 2 bits
+	// -(2^1) to (2^1 - 1)
+	// -1 to +1, -2, -1, 0, 1
+
+	// 2 bits => 00, 01, 10, 11 (4 possible combinations)
+	// 3 bits => 000, 001, 010, 011, 100, 101, 110, 111 (8 in total)
+	// n bits => 2^n combinations
+	return 0;
+}

Day 1/variable.c

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+/*
+ * Understanding variable in C
+ */
+
+#include <stdio.h>
+#include <math.h>
+
+int main () {
+
+	int variable_int = 2;
+	char variable_char = 'a';
+
+	printf("Value of the int variable is: %d\n", variable_int);
+	printf("Value of char variable is: %c\n", variable_char);
+	return 0;
+}

Day 2/arithmeticOperators.c

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+/*
+ * Understand the arithmetic operators in C
+ */
+
+#include <stdio.h>
+
+int main() {
+  
+  int x, y;
+  printf("Please enter number1: ");
+  scanf("%d", &x);
+  printf("Please enter number2: ");
+  scanf("%d", &y);
+
+  // add two numbers
+  int addResult = x + y;
+
+  // subtract two numbers
+  int subtractResult = x - y;
+
+  // multiply the numbers
+  int multiplyResult = x * y;
+
+  // divide the numbers
+  int divideResult = x / y;
+
+  printf("Add: %d\n, Subtract: %d\n, Multiply: %d\n, Divide: %d\n", addResult, subtractResult, multiplyResult, divideResult);
+
+  int moduloResult = x % y;
+  printf("Remainder of x divided by y: %d\n", moduloResult);
+
+  return 0;	
+  	
+}

Day 2/assignmentOperator.c

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+/*
+ * Understand the assignment operators in C
+ */
+
+#include <stdio.h>
+
+int main() {
+  
+  int x, y;
+  printf("Please enter number1: ");
+  scanf("%d", &x);
+  printf("Please enter number2: ");
+  scanf("%d", &y);
+
+  // add two numbers
+  int result = x + y;
+  // the above statement computes the result of (x + y)
+  // and assigns that result to the variable named 'addResult'
+
+  // a += b is equivalent to a = a + b
+  // a -= b is equivalent to a = a - b
+  // a *= b is equivalent to a = a * b
+  // a /= b is equivalent to a = a / b
+
+  int z;
+  printf("Please enter third number: ");
+  scanf("%d", &z);
+  
+  // result = result + z;
+  result += z;
+
+  printf("Final sum of three numbers: %d\n", result);
+
+  // unary operator: works on a single value
+
+  // we want to add one to the result
+  // result = result + 1;
+  result ++;
+  // result = result - 1;
+  result --;
+  printf("Result: %d\n", result);
+  return 0;	
+  	
+}

Day 2/endQuestion1.c

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+/*
+ * Understand the Logical operators in C
+ */
+
+#include <stdio.h>
+
+int main() {
+  
+  int x, y = 5, z = 5;
+
+  x = y == z;
+
+  printf("%d\n", x);
+
+  return 0;	
+}

Day 2/float.c

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+#include <stdio.h>
+
+int main() {
+   float c = 5.0;
+   printf ("Temperature in Fahrenheit is %f", (9/5.0)*c + 32);
+   // if the operands are integers
+   // division will perform integer division
+   // Mathematically, 9/5 = 1.8, it will truncate the value after decimal point
+   // In C: 9/5 = 1
+   return 0;
+}

Day 2/inputOutput.c

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+/*
+ * Program to understand data types in C
+ */
+
+#include <stdio.h>
+
+int main () {
+
+	int x = 3;
+
+	printf("int: %d\n", x);
+
+	char ch = 'Z';
+	printf("char: %c\n", ch);
+
+	double d = 32.515512515151515213131312321412412412421412412451245151241231234214521351535324123424234452352523;
+	printf("double: %f\n", d);
+
+	float f = 32.515512515151515213131312321412412412421412412451245151241231234214521351535324123424234452352523;
+	printf("float: %f\n", f);
+
+	printf("Printing the size of the variables:\n\n");
+	printf("size of int: %lu\n", sizeof(x));
+	printf("size of char: %lu\n", sizeof(ch));
+	printf("size of float: %lu\n", sizeof(d));
+	printf("size of double: %lu\n", sizeof(f));
+	return 0;
+}

Day 2/logicalOperators.c

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+/*
+ * Understand the Logical operators in C
+ */
+
+#include <stdio.h>
+
+int main() {
+  
+  int x = 4;
+
+  int y = 3;
+
+  // (expression 1) == (expression 2)
+  // this means we are checking whether both give the same result
+  int z = (x == y);
+  printf("X equals Y: %d\n", z);
+
+  return 0;	
+}

Day 2/long.c

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+#include <stdio.h>
+
+int main() {
+  	
+  	long long longInteger = 354551315513135;
+
+  	printf("Value of longInteger is: %lld\n", longInteger);
+
+  	return 0;
+}

Day 2/printf.c

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+#include <stdio.h>
+
+int main() {
+  	
+  	int var1 = 2, var2 = 3, var3 = 4;
+
+  	printf("All variables: %d, %d, %d\n", var1, var2, var3);
+
+  	return 0;
+}

Day 2/scanf.c

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+#include <stdio.h>
+
+int main() {
+  	
+  	int number;
+
+  	printf("Please enter the number: ");
+
+  	scanf("%d", &number);
+
+  	printf("The number input from the user is: %d", number);
+
+  	return 0;
+}

Day 2/unaryOperator.c

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+/*
+ * Understand the Unary operators in C
+ */
+
+#include <stdio.h>
+
+int main() {
+  
+  int x = 4;
+
+  // post increment
+  int y = x++;
+
+  printf("\nPOST INCREMENT: \n");
+  printf("Value of y: %d\n", y);
+  printf("Value of x: %d\n", x);
+
+  // pre increment
+  int z = ++x;
+
+  printf("\nPRE INCREMENT: \n");
+  printf("Value of z: %d\n", z);
+  printf("Value of x: %d\n", x);
+  return 0;	
+}