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Actually, the header files only contain the declarations of the functions... for example.... the declaration of cout is in iostream as "extern ostream cout" but its only declaration and the compiler will not know where its actual definition lies(i.e how this function should work) and it is defined in a …
#include<stdio.h> int main() { float price=56.95,tax=1.05; float total=0; printf("total=%f",price*tax); } the output will be total=59.797497
The End.