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C (tcc), 39 21 10 bytes

I was actually quite surprised nobody thought of using C.

f(int i){}

This is not an identity function as it seems to be. The implicit int type of the f function trunctuates the floating-point.

TIO JoKing-11B

C (tcc), 39 21 10 bytes

I was actually quite surprised nobody thought of using C.

f(float i){}

This is not an identity function as it seems to be. The implicit int type of the f function trunctuates the floating-point.

TIO

Less likely to trick people but has a shorter byte length:

f(int i){}

TIO

C (tcc), 39 21 / 19? bytes

I was actually quite surprised nobody thought of using C.

f(float i){return i;}

This is not an identity function as it seems to be. The implicit int type of the f function trunctuates the floating-point.

TIO

This works(19 bytes): (although it is quite weird that this does not work: f(i){return i;})

f(int i){return i;}

Old solution to STDIN/STDOUT, 39 bytes

main(i){scanf("%d",&i);printf("%d",i);}

i is an integer, and taking input trunctuates the decimal value. Outputting as decimal retrieves that value.

TIO

C (tcc), 39 21 10 bytes

I was actually quite surprised nobody thought of using C.

f(int i){}

This is not an identity function as it seems to be. The implicit int type of the f function trunctuates the floating-point.

TIO JoKing-11B

C (tcc), 39 21 / 19? bytes

I was actually quite surprised nobody thought of using C.

f(float i){return i;}

This is not an identity function as it seems to be. The implicit int type of the f function trunctuates the floating-point.

This works(19 bytes): (although it is quite weird that this does not work: f(i){return i;})

f(int i){return i;}

TIO

Old solution to STDIN/STDOUT, 39 bytes

main(i){scanf("%d",&i);printf("%d",i);}

i is an integer, and taking input trunctuates the decimal value. Outputting as decimal retrieves that value.

TIO

C (tcc), 39 21 / 19? bytes

I was actually quite surprised nobody thought of using C.

f(float i){return i;}

This is not an identity function as it seems to be. The implicit int type of the f function trunctuates the floating-point.

TIO

This works(19 bytes): (although it is quite weird that this does not work: f(i){return i;})

f(int i){return i;}

Old solution to STDIN/STDOUT, 39 bytes

main(i){scanf("%d",&i);printf("%d",i);}

i is an integer, and taking input trunctuates the decimal value. Outputting as decimal retrieves that value.

TIO