function pointer in calc app

shazaAly/README.md

@@ -0,0 +1,52 @@
+# calc.h
+
+**Description:**
+`calc.h` is a header file that provides function prototypes for basic mathematical operations. The file contains declarations for functions to perform addition, subtraction, multiplication, division, and exponentiation.
+
+**Usage:**
+To use the functions defined in this header file, include `calc.h` in your C/C++ source code and link with the appropriate implementation.
+
+**Note:**
+Ensure that you have the necessary math library linked when using `expo` function to utilize the `pow()` function.
+
+## Functions:
+
+### `double add(double a, double b)`
+This function takes two double precision floating-point numbers `a` and `b` as input and returns their sum.
+
+### `double sub(double a, double b)`
+This function takes two double precision floating-point numbers `a` and `b` as input and returns the result of subtracting `b` from `a`.
+
+### `double mul(double a, double b)`
+This function takes two double precision floating-point numbers `a` and `b` as input and returns their product.
+
+### `double div(double a, double b)`
+This function takes two double precision floating-point numbers `a` and `b` as input and returns the result of dividing `a` by `b`. If `b` is equal to zero, it will print an error message and return 0.00 to avoid division by zero.
+
+### `double expo(double a, double b)`
+This function takes two double precision floating-point numbers `a` and `b` as input and returns `a` raised to the power of `b`. Make sure to link the necessary math library to use the `pow()` function.
+
+**Example:**
+```c
+#include <stdio.h>
+#include "calc.h"
+
+int main() {
+    double num1 = 10.0;
+    double num2 = 5.0;
+
+    printf("Addition: %.2f\n", add(num1, num2));
+    printf("Subtraction: %.2f\n", sub(num1, num2));
+    printf("Multiplication: %.2f\n", mul(num1, num2));
+    printf("Division: %.2f\n", div(num1, num2));
+    printf("Exponentiation: %.2f\n", expo(num1, num2));
+
+    return 0;
+}
+```
+
+**Note:** Don't forget to link with the math library when compiling the code that uses the `expo` function:
+
+```
+gcc -o my_program my_program.c -lm
+```

shazaAly/calc.c

@@ -0,0 +1,68 @@
+#include "calc.h"
+/**
+* add - Adds two numbers.
+* @a: The first number.
+* @b: The second number.
+*
+* Return: The sum of @a and @b.
+*/
+double add(double a, double b)
+{
+	return a + b;
+}
+/**
+* sub - Subtracts two numbers.
+* @a: The first number.
+* @b: The second number.
+*
+* Return: The result of @a minus @b.
+*/
+
+double sub(double a, double b)
+{
+	return a - b;
+}
+/**
+* mul - Multiplies two numbers.
+* @a: The first number.
+* @b: The second number.
+*
+* Return: The product of @a and @b.
+*/
+double mul(double a, double b)
+{
+	return a * b;
+}
+
+/**
+* div - Divides two numbers.
+* @a: The first number.
+* @b: The second number.
+*
+* Return: The result of @a divided by @b.
+*         If @b is zero, returns 0.00 and prints an error message.
+*/
+double div(double a, double b)
+{
+	if (b != 0)
+	{
+		return (a / b);
+	}
+	else
+	{
+		printf("Error: Division by zero\n");
+        return 0.00;
+	}
+
+}
+/**
+* expo - Computes the exponentiation of a number.
+* @a: The base number.
+* @b: The exponent.
+*
+* Return: The result of @a raised to the power of @b.
+*/
+double expo(double a, double b)
+{
+	return pow(a, b);
+}

shazaAly/calc.h

@@ -0,0 +1,16 @@
+#ifndef CALC_H
+#define CALC_H
+
+#include <math.h>
+#include <stdio.h>
+#include <unistd.h>
+
+
+double add(double a, double b);
+double sub(double a, double b);
+double mul(double a, double b);
+double div(double a, double b);
+double expo(double a, double b);
+
+
+#endif

shazaAly/main.c

@@ -0,0 +1,52 @@
+#include "calc.h"
+
+int main()
+{
+	double a, b, result;
+	char op;
+
+	printf("Enter the first number: ");
+	scanf("%lf", &a);
+	sleep(2);
+	printf("Enter the second number: ");
+	scanf("%lf", &b);
+	printf("Enter an arithmetic operator (+, -, *, /, ^): ");
+	scanf(" %c", &op);
+
+	/*declare function pointer*/
+	double (*operation)(double, double);
+
+	switch (op)
+	{
+		case '+':
+			operation = add;
+			break;
+
+		case '-':
+			operation = sub;
+			break;
+
+		case '*':
+			operation = mul;
+			break;
+
+		case '/':
+			operation = div;
+			break;
+
+		case '^':
+			operation = expo;
+			break;
+
+	default:
+	printf("Invalid operator \n");
+	return (1);
+	}
+
+	result = operation(a, b);
+	printf("Result: %lf\n",result);
+	return (0);
+
+
+
+}