In C, Compute Total Retail Price Of Products Sold

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#include<stdio.h>
void main(){
    const float prices[]={2.95f, 4.99f, 5.49f, 7.80f, 8.85f};
    const int len = sizeof(prices)/sizeof(float);
    float total = 0.0f;
    int no, i, qty;
    do{
        printf("Product No.  Price\n");
        printf("------------------\n");
        for(i = 0; len > i; i ++)
            printf("%d)%10s$%.2f\n", (1+i), "", prices[i]);
        fflush(stdin);
        printf("\nEnter product no# (0 to quit): ");
        if(!scanf("%d", &no)){
            printf("Error: Invalid input!\n");
            continue;
        }
        if(0 == no) break;
        if(1 > no || len <= no){
            printf("Error: Invalid product no#!\n");
            continue;
        }
        fflush(stdin);
        printf("\nEnter quantity: ");
        if(!scanf("%d", &qty)){
            printf("Error: Invalid input!\n");
            continue;
        }
        if(1 > qty){
            printf("Error: Invalid quantity!\n");
            continue;
        }
        total += (prices[no-1] * qty);
    }while(1);
    if(total){
        printf("Total retail: $%.2f\n", total);
    } else {
        printf("Warn: No retail data found!");
    }
}