int main() {
char operator;
double num1, num2, result;<\/p>\n\n\n
\n\/\/ Prompt the user for input\nprintf("Enter first number: ");\nscanf("%lf", &num1);\n\nprintf("Enter an operator (+, -, *, \/): ");\nscanf(" %c", &operator); \/\/ Notice the space before %c to consume any newline character\n\nprintf("Enter second number: ");\nscanf("%lf", &num2);\n\n\/\/ Perform calculation based on operator\nswitch (operator) {\n case '+':\n result = num1 + num2;\n printf("%.2lf + %.2lf = %.2lf\\n", num1, num2, result);\n break;\n case '-':\n result = num1 - num2;\n printf("%.2lf - %.2lf = %.2lf\\n", num1, num2, result);\n break;\n case '*':\n result = num1 * num2;\n printf("%.2lf * %.2lf = %.2lf\\n", num1, num2, result);\n break;\n case '\/':\n \/\/ Check for division by zero\n if (num2 != 0) {\n result = num1 \/ num2;\n printf("%.2lf \/ %.2lf = %.2lf\\n", num1, num2, result);\n } else {\n printf("Error: Division by zero is not allowed.\\n");\n }\n break;\n default:\n printf("Error: Invalid operator.\\n");\n break;\n}\n\nreturn 0;\n<\/pre><\/div>\n\n\n}<\/p>\n\n\n\n
Explanation:-<\/p>\n\n\n\n
Headers and Main Function<\/strong>: The code begins by including the standard input-output library (<stdio.h><\/code>) and defining the main<\/code> function.<\/p>\n\n\n\nVariables Declaration<\/strong>: Four variables are declared:<\/p>\n\n\n\n\noperator<\/code>: to store the arithmetic operator entered by the user.<\/li>\n\n\n\nnum1<\/code> and num2<\/code>: to store the two numbers on which the operation will be performed.<\/li>\n\n\n\nresult<\/code>: to store the result of the operation.<\/li>\n<\/ul>\n\n\n\nUser Input<\/strong>:<\/p>\n\n\n\n\n- The program prompts the user to enter the first number, the operator, and the second number. The
scanf<\/code> function is used to read these inputs.<\/li>\n<\/ul>\n\n\n\nSwitch Case Statement<\/strong>: This statement evaluates the operator<\/code> variable:<\/p>\n\n\n\n\n- For each case (
+<\/code>, -<\/code>, *<\/code>, \/<\/code>), it performs the corresponding arithmetic operation and prints the result.<\/li>\n\n\n\n- If the operator is
\/<\/code>, it checks if the second number is zero to prevent division by zero. If it is zero, an error message is displayed.<\/li>\n<\/ul>\n\n\n\nDefault Case<\/strong>: If the user enters an invalid operator, the program outputs an error message.<\/p>\n\n\n\nExample:<\/p>\n\n\n\n
Suppose a user runs the program and enters the following:<\/p>\n\n\n\n
Enter first number: 10
Enter an operator (+, -, *, \/): +
Enter second number: 5<\/p>\n\n\n\n
10.00 + 5.00 = 15.00<\/p>\n