Thread: Multiplication with Sort Function

I need to include validation to only accept numbers and to only the last four odd numbers in the table. Appreciate if someone could help

Code:

#include <stdio.h>void main() {
int upper, range, i;
    printf("Enter an integer to find multiplication table: ");
    scanf("%d",&upper);
    printf("Enter range of multiplication table: ");
    scanf("%d",&range);
    for(i=1;i<=range;++i) {
        if(i % 2 !=0){
         printf("%d x %d = %d""*""\n", upper, i, upper*i);
        }
        else {
            printf("%d x %d = %d\n", upper, i, upper*i);
        }
        }
        printf("\n* Indicates the Odd Numbers\n");
    return 0;
}

Sorry abt that.. i need to mark the last odd numbers with an asterisk

I need to include validation to only accept numbers...

For validation, one approach would be to check the return value of "scanf()". A better approach would be to create a separate function for reading and validating input, using "fgets()" to read the entire input as a string and parsing it as needed (e.g. "sscanf()").

Sorry abt that.. i need to mark the last odd numbers with an asterisk

So not all odd numbers, but only the last few? You need to be more clear on your requirements. If you are only supposted to be marking the last couple of odd numbers, you would need a way to know when you're "getting close" to the end so you can start printing the asterisks - this would likely require keeping track of the results generated (i.e. with an array).

Also, your logic is adding an asterisk to the equations where the multiplicand, not the result, is odd.

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Note that "main()" should be returning int, not void: FAQ > main() / void main() / int main() / int main(void) / int main(int argc, char *argv[]) - Cprogramming.com

You should also make sure your code has neat and consistent formatting and indenting; something like this:

Code:

#include <stdio.h>

void main()
{
    int upper, range, i;
    
    printf("Enter an integer to find multiplication table: ");
    scanf("%d",&upper);
    
    printf("Enter range of multiplication table: ");
    scanf("%d",&range);
    
    for(i=1;i<=range;++i) {
        if(i % 2 !=0){
            printf("%d x %d = %d""*""\n", upper, i, upper*i);
        }
        else {
            printf("%d x %d = %d\n", upper, i, upper*i);
        }
    }
    
    printf("\n* Indicates the Odd Numbers\n");
    
    return 0;
}