Uma das funções de um software é realizar aqueles cálculos que para nós fazermos manualmente demandaria muito tempo.
Neste vídeo vou te mostrar como podemos fazer cálculos com operadores aritméticos e de atribuição utilizadas no Javascript.
Vamos conversar sobre operadores aritméticos e operadores de atribuição, as mesmas operações aritméticas básicas que aprendemos na escola.
Operadores Aritméticos E De Atribuição Em Javascript
Operadores são símbolos que executam uma manipulação matemática ou lógica específica.
A linguagem Javascript tem um rico conjunto internos de operadores e disponibiliza os seguintes tipos para nós.
- Aritméticos
- Atribuição
- Comparação
- Lógicos
- Bit a bit
Como este assunto de operadores é um pouco extenso, vou dividir o conteúdo em vários vídeos para podermos ver alguns detalhes importantes de cada grupo.
Vamos começar conhecendo os operadores aritméticos e de atribuição em Javascript.
Operadores Aritméticos
Os operadores aritméticos são aqueles que executam operações matemáticas e com certeza você já os viu na escola.
Operadores De Atribuição
Operadores de atribuição são utilizados para atribuirmos um valor a uma variável.
Pode ser para definir um valor inicial ou para sobrescrever um valor já existente.
| Operador | Descrição | Exemplo |
| = | Atribuição | C = A + B atribui o valor de A + B em C |
| += | Atribuição de soma | C += A equivale a C = C + A |
| -= | Atribuição de subtração | C -= A equivale a C = C – A |
| *= | Atribuição de multiplicação | C *= A equivale a C = C * A |
| /= | Atribuição de divisão | C /= A equivale a C = C / A |
| %= | Atribuição de resto | C %= A equivale a C = C % A |
Precedência de Operadores
A precedência de operador determina o agrupamento em uma expressão.
Isso afeta o resultado de uma expressão. Certos operadores têm maior precedência do que outros.
Lembra de quando você resolvia equações na escola?
Existia uma regra, uma ordem que deve ser seguida para resolver as operações de uma expressão.
Por exemplo, o operador de multiplicação tem maior precedência do que o operador de adição.
E para fazer com que a equação fosse resolvida em outra ordem, utilizamos parênteses.
Na programação funciona assim também.
Por exemplo:
x = 7 + 3 * 2
Primeiro resolvemos a multiplicação e depois a adição.
X = 7 + 6
X = 13
Para resolvermos a adição primeiro, utilizamos parênteses:
x = (7 + 3) * 2
x = 10 * 2
x = 20
ATIVIDADE
- Complemente o arquivo a seguir com o código capaz de realizar a soma de dois números: soma.html
- O IMC (Índice de massa corporal) é uma formula utilizada para verificar se um adulto ou criança está acima do peso, obeso ou abaixo do peso ideal. Para tal, necessitamos aplicar a seguinte fórmula
IMC = peso / (altura x altura)
Complete o código para efetuar corretamente o cálculo do IMC: IMC.html - Complemente o arquivo a seguir com o código necessário para calcular o valor total das parcelas de um empréstimo: valorTotal.html
- Complemente o arquivo a seguir com o código necessário para calcular o valor total do produto com o calculo da porcentagem de imposto sobre o produto: imposto.html
- Faça um site utilizando HTML e Javascript. O site deve receber 3 notas de um aluno e exibir na tela a média dessas 3 notas.
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