Error in console concatenation.log

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var A, B, C;
  A=prompt("Digite um valor.");
  B=prompt("Digite um valor.");
  C=prompt("Digite um valor.");
console.log("TRIANGULO: "+(A*C)/2);
console.log("CIRCULO: "+(3.14159*C*C));
console.log("TRAPEZIO: "+(A+B)*C/2);
console.log("QUADRADO: "+(B*B));
console.log("RETANGULO: "+(A*B));

In console.log("TRAPEZIO: "+(A+B)*C/2); the result is 34 and I don’t understand why.

javascript

  • Prompt returns string, so A+B concatenates instead of adding. Use Number(A) + Number(B) to solve.

  • Thank you, I tried using promptNumber but could not. I had faced this problem before.

  • There is no promptNumber ... do so: A=Number(prompt("Digite um valor.")); and then on the console.log isolate the string’s mathematical operation with parentheses: console.log("TRAPEZIO: " + ((A+B)*C/2) );

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