#include <math.h>void ttest(float data1[], unsigned long n1, float data2[], unsigned long n2,	float *t, float *prob){	void avevar(float data[], unsigned long n, float *ave, float *var);	float betai(float a, float b, float x);	float var1,var2,svar,df,ave1,ave2;	avevar(data1,n1,&ave1,&var1);	avevar(data2,n2,&ave2,&var2);	df=n1+n2-2;	svar=((n1-1)*var1+(n2-1)*var2)/df;	*t=(ave1-ave2)/sqrt(svar*(1.0/n1+1.0/n2));	*prob=betai(0.5*df,0.5,df/(df+(*t)*(*t)));}