implemented the calculator functions

dprofcode/README.md

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+# Calculator Project
+
+## Project Description
+
+The calculator program allows user to perform arithmetic operations by entering two numbers and an arithmetic operator.

dprofcode/calc.h

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+#ifndef CALC_H
+#define CALC_H
+
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <stdbool.h>
+
+int handle_calc(int first_number, int second_number, char *operator);
+
+int sum(int first_number, int second_number);
+int minus(int first_number, int second_number);
+int multiply(int first_number, int second_number);
+int divide(int first_number, int second_number);
+
+#endif

dprofcode/functions.c

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+#include "calc.h"
+
+/**
+ * sum - adds two numbers
+ *
+ * @first_number: first number
+ * @second_number: second_number
+ */
+
+int sum(int first_number, int second_number)
+{
+	return (first_number + second_number);
+}
+
+/**
+ * minus - difference between two numbers
+ *
+ * @first_number: first number
+ * @second_number: second_number
+ */
+
+int minus(int first_number, int second_number)
+{
+	return (first_number - second_number);
+}
+
+/**
+ * multiply - product of two numbers
+ *
+ * @first_number: first number
+ * @second_number: second_number
+ */
+
+int multiply(int first_number, int second_number)
+{
+	return (first_number * second_number);
+}
+
+/**
+ * divide - division between two numbers
+ *
+ * @first_number: first number
+ * @second_number: second_number
+ */
+
+int divide(int first_number, int second_number)
+{
+	if (second_number == 0)
+	{
+		printf("Error: Division by zero\n");
+		return (0);
+	}
+
+	return (first_number / second_number);
+}

dprofcode/handle_calc.c

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+#include "calc.h"
+
+/**
+ * handle_calc - handles the calculation
+ *
+ * Return: solution
+ */
+
+int handle_calc(int first_number, int second_number, char *operator)
+{
+    int soln;
+
+    if (strcmp(operator, "+") == 0)
+        soln = sum(first_number, second_number);
+    else if (strcmp(operator, "-") == 0)
+        soln = minus(first_number, second_number);
+    else if (strcmp(operator, "*") == 0)
+        soln = multiply(first_number, second_number);
+    else if (strcmp(operator, "/") == 0)
+        soln = divide(first_number, second_number);
+    else
+    {
+        printf("operator not found\n");
+        return (-1);
+    }
+
+    return (soln);
+}

dprofcode/main.c

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+#include "calc.h"
+
+/**
+ * main - program start point
+ *
+ * Return: 0;
+ */
+
+int main()
+{
+	int first_number, second_number, result;
+	char operator[2];
+
+	setbuf(stdout, NULL);
+
+	printf("======================Calculator======================\n");
+
+	printf("This calculator can carry out the following functionalities: \nAddition\nSubtraction\nMultiplication\nDivision\n");
+
+	printf("Enter the numbers and operators below\n");
+
+	while (true)
+	{
+		printf("Enter the first number: ");
+		scanf("%d", &first_number);
+
+		if (first_number != 0)
+		{
+			break;
+		}
+
+		printf("Please enter a valid number.\n");
+	}
+
+	while (true)
+	{
+		printf("Enter the second number: ");
+		scanf("%d", &second_number);
+
+		if (second_number != 0)
+		{
+			break;
+		}
+
+		printf("Please enter a valid number.\n");
+	}
+
+	while (true)
+	{
+		printf("Enter the operator: ");
+		scanf("%1s", &operator);
+
+		if (handle_calc)
+		{
+			break;
+		}
+
+		printf("Please enter a valid operator.\n");
+	}
+
+	result = handle_calc(first_number, second_number, operator);
+
+	printf("Result: %d", result);
+	return (0);
+}