発展2
#include <stdio.h> int main() { int a,b,N,i; printf("Please input three integers for an interval and a resolution : "); scanf("%d%d%d",&a,&b,&N); double ans = (double)a*a,sa = ( (double)(b-a) / (double)N ),nau = (double)a; for(i = 1;i <= N;i++){ nau += sa; ans += nau*nau*sa; } printf("Definite integral from %d to %d of x^2 : %f\n",a,b,ans); return 0; }