Q: Why doesn't this code:
double d;
scanf("%f", &d);
work?
A: Unlike printf, scanf uses %lf for values of type double, and %f for float. [footnote] %f tells scanf to expect a pointer-to-float, not the pointer-to-double you gave it. Either use %lf, or declare the receiving variable as a float. See also question 12.9.
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