81 lines
1.5 KiB
D
81 lines
1.5 KiB
D
// LET'S CREATE A CALCULATOR!
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// LEARN: USER INPUT, IF STATEMENTS (logical expressions), ARITHMETIC OPERATIONS
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// importing the entire library
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// import std.stdio;
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// importing writeln, write and readf functions
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import std.stdio: writeln, write, readf;
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void main() {
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float a = 0;
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float b = 0;
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char operation; // '+', '-', '*', '/'
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write("first number: ");
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readf(" %s", a);
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write("second number: ");
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readf(" %s", b);
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write("operation: ");
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readf(" %s", operation);
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/*
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// readf could be used to read everything at once
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write("expression: ");
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readf(" %s %s %s", a, operation, b);
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*/
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/*
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Boolean data type, can either be true or false.
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bool gameOver = false;
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The syntax of an if statement
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if(condition) {
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instructions;
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} else {
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instructions;
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}
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if(condition1) {
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instructions;
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} else if(condition2) {
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instructions;
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} else if(...) {
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instructions;
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} else {
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instructions
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}
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*/
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if(operation == '+') {
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writeln(a, operation, b, "=", a+b);
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} else if(operation == '-') {
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writeln(a, operation, b, "=", a-b);
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} else if(operation == '*') {
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writeln(a, operation, b, "=", a*b);
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} else if(operation == '/') {
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writeln(a, operation, b, "=", a/b);
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} else {
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writeln("Unknown operation! Error!");
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}
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/*
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== (is equal to), != (is not equal to), && (and), || (or)
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operation could either be '+' or '-'
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if(operation == '+' || operation == '-') {
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instructions;
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}
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we check if both a and b are 0
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if(a == 0 && b == 0) {
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instructions;
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}
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*/
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}
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