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GATE Overflow Test Series | Programming | Test 1 | Question: 12

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Consider the following C program fragment:

double a = getMyDouble();
float b, c;
b = getMyFloat();
c = a + b;


If the assembly instruction corresponding to the addition is "ADD R0, R1" where R0 is having the value corresponding to the variable b, the minimum required size in bytes of the register R0 is _____ bytes.

 

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In C language when we do an operation involving operands of different sizes, the smaller one is changed to the larger. So, here even though b is of type float, since addition is done with a double, it also gets converted to a double. So, minimum size required of the register is $8$ bytes.
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