TCS NQT Set 3 | Day 1 2020 | Decimal conversion

TCS NQT 2020 | Day 1 | Set 3

Given a maximum of four-digit to the base 17 (10 – A, 11 – B, 12 – C, 13 – D … 16 – G} as
input, output its decimal value.

Logic:

• Get the input as a string because it contains both integer and character.
• Then assign A=10,B=11………. G=16.
• Convert the character to an integer using ASCII
• Apply the rule for any number to decimal conversion.
• Here base value 17, then move from right to left and the power value starts from 0 then increments
• Find the power of 17 from 0 to length of string and correspondingly add the value in a variable
• Then print the result which is the decimal value.

Other numbers to Decimal conversion

• Step 1 − Determine the column (positional) value of each digit (this depends on the position of the digit and the base of the number system).
• Step 2 − Multiply the obtained column values (in Step 1) by the digits in the corresponding columns.
• Step 3 − Sum the products calculated in Step 2. The total is the equivalent value in decimal.

TCS NQT Set 3

Program:

#include<stdio.h>
int pow(int a,int n)
{
    int b=a;
    if(n==0)        //return 1 when n value is 0
    {
        return 1;
    }
    while(n>1)     //calculate the power value
    {
        a*=b;
        n--;
    }
    return a;
}
void main()
{
    char a[50];
    int n,i,j=0,decimal=0;
    printf("Enter the base 17 number:");
    scanf("%s",&a);                    //get the input as string
    n=strlen(a);
    while(n>0)
    {
        if(a[n-1]>64&&a[n-1]<72)      //check the char between A to G
        {
            i=a[n-1]-55;              //convert A=10,b=11 ..... G=16
            decimal+=i*pow(17,j);     //calculate the decimal value
            n--,j++;
        }
        else                          //check for number 0 to 9
        {
            i=a[n-1]-48;              //convert char value to int
            decimal+=i*pow(17,j);
            n--,j++;
        }
    }
    printf("%d\n",decimal);           // print the converted decimal value
}

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