Question

need explanation thx

Fill in each column with the value of the vari- able after each line of code has run. If the vari- able has not been declared, write ?. If the vari- able has been declared but not initialized, write *. let x: number = 15; let y: number; x = x + 8; let z: number = 9; y = x + z;

Answer 1

Solution

Answer

let x: number = 15; let yż number: x = x + 8; let z: number = 9; y = x+z; 15 ? 15 * 23 * 23 23 32 ? ? ? 9

Explanation

let x: number = 15; 15 ? ?

in this statement x is declared and initialized to 15

so we write

x=15

but y and z not declared and initialized so we write "?"

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15 ? ? let x: number = 15; let y: number, 15

in this statement we declare y but not initialized so we write "*

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let x: number = 15; let y: number: x = x+8; 15 ? 15 * ? ? 23

in this statement now we are adding value 8 to the value of x

x=15+8

x=23

y already declared, z still not declared

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let x: number = 15; let y: number; x = x+8; let z: number = 9; 15 ? 15 * 23 * 23 * ? ? ? 9

now z is declared and initialized

so write 9 in z

please note y still not initialized

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15 ? * ? ? Tev y. number, 15 let x: number = 15; let y: number; x = x + 8; let z: number = 9; y = x+z; 23 * 23 * 23 32 ? 9 9

now we are adding value of x and z storing in y

so y=23+9

y=32

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all the best