#include void main() { int i,n; float s1,s2; s1=s2=0; printf("give me data --> "); scanf("%d",&n); for (i=1; i<=n; i++) if (i%2 == 1) s1+=(float)i*i; else s2+=(float)i*i; if (n % 2 == 0) { printf("1^2+2^2+3^2+...+%d^2=%.2f\n",n-1,s1); printf("1^2+2^2+3^2+...+%d^2=%.2f\n",n,s2); } else { printf("1^2+2^2+3^2+...+%d^2=%.2f\n",n,s1); printf("1^2+2^2+3^2+...+%d^2=%.2f\n",n-1,s2); } }