erfc: returns the complementary error function
//Declaration: float erfcf(float arg);
double erfc(double arg);
long double erfcl(long double arg);
#include <math.h>
#include <stdio.h>
int main(void)
{
printf("Value of e to the first: %f.", erfc(1.1));
}
/*
Value of e to the first: 0.119795.*/
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