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Returns the error function of arg

//Header file: #include <math.h> //Declaration: float erff(float arg); double erf(double arg); long double erfl(long double arg); #include <math.h> #include <stdio.h> int main(void) { printf("Value of e to the first: %f.", erf(1.0)); } /* Value of e to the first: 0.842701.*/