if and else both is being excuted

I have strange problem with a simple c program.

#include<stdio.h> 
#include<math.h>
#include<conio.h>
main() {
    int a, b, c, delta;
    float x1, x2;
    printf("Please Enter a,b,c :");
    scanf("%d%d%d",&a,&b,&c);
    delta = (b * b) - (4 * (a * c));
    if(delta < 0){
        printf("No roots!");
    } 
    else{
        if (delta >= 0){
            x1 = (-b + sqrt(delta)) / (2 * a);
            x2 = (-b - sqrt(delta)) / (2 * a);
        }
    }
    printf("r1=%f and r2=%f", x1, x2);
    getch();

}

when I enter 2 1 1, it seems, the program executes both if and else in line 10 and 13. The output is No roots!x1=0.0000 and x2=0.0000 what's wrong?