The program
Edit anything and press Run. The output below was produced by running this exact code.
Expected output
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0 C = 32 F25 C = 77 F37 C = 98.6 F100 C = 212 F98.6 F = 37 C-40 C = -40 F (dono scale yahan barabar hain!)
How it works
The formulas are F = C x 9 / 5 + 32 and C = (F - 32) x 5 / 9. Each becomes a one-line function that returns the answer.
Brackets matter in f_se_c: without them the 32 would be multiplied first. The loop converts four common temperatures, and the last line shows the one point where both scales agree: minus 40.