CO_assign_q1, C (gcc)

CO_assign_q1

#include <stdio.h>
#include <string.h>
#include <math.h>
#define MAX 100

int arr[MAX];
int dec[MAX];
char num[MAX];
int store = 0;

void Bin_Bits(unsigned n,int k,int ch)
{
    //k refers to the max number of bits to be shown
    unsigned i;
    int count = 1;
    for(i = 1<<k-1; i > 0; i = i/2)
    {
        if(n & i)
            printf("1");
        else
            printf("0");

if(ch == 1)
        {
            if(count % 8 == 0) //This is for printing in intervals of 8 bits at a time if the choice is 1
            printf(" ");
            count++;
        }

}
    printf(" ");
}

void BinaryCalculate(int n)
{
    int i = 0,j;
    if(n == 0)
    {
        arr[i] = 0;
        num[store++] = '0';
        num[store++] = '.';
        return;
    };
    while(n > 0)
    {
        arr[i++] = n % 2;
        n = n/2;
    }
    int length = i;
    for(j = length-1; j >= 0; j--)
    {
        if(arr[j] > 0)
            num[store++] ='1';
        else
            num[store++]='0';
    }
    num[store++] = '.';
}

void Trunc_Decimal(float n)
{
    int i = 0,count = 0,k;
    float temp = n,t;
    if(n == 0.0)
    {
        dec[i++] = 0;
        num[store++] = '0';
        return;
    }
    while(count != 23)
    {
        dec[i++] = (int)(temp * 2);
        if((int)(temp * 2) == temp * 2)
            break;
        t = temp * 2;
        temp =  t - (int)(t);
        count++;
    }
    for(k = 0; k < i; k++)
    {
        //printf("%d",dec[k]);
        if(dec[k]>0)
            num[store++] ='1';
        else
            num[store++]='0';
    }
}

int Shift(char s[])
{
    int i=0,j,count = 0;
    char t;
    int sign = s[0] - '0';
    if(sign == 1)
    {
        for(i = 0; s[i] != '\0'; i++)
        {
            if(s[i] == '.')
            {
                j = i;
                while(j != 1)
                {
                    t = s[j];
                    s[j] = s[j-1];
                    s[j-1] = t;
                    count++;
                    j--;
                }
            }
        }
    }
    else if(sign == 0)
    {
        i = 1;
        while(s[i-1] != '1')
        {
            t = s[i];
            s[i] = s[i+1];
            s[i+1] = t;
            i++;
            count--;
        }
        //printf("\n%d\n",count);

}
    return count;

}

void Check_Mantissa(char s[],int ch)
{
    int n,i,j,k;
    if(ch == 3)
        k = 23;
    else
        k = 52;
    if(s[0] == '0')
    {
        for(i = 0; s[i] != '\0'; i++)
        {
            if(s[i] == '.')
            {
                n = strlen(s) - i;
                for(j = i+1; s[j] != '\0'; j++)
                    printf("%c",s[j]);
            }
        }

}

else
    {
        n = strlen(s) - 2;
        for(j = 2; s[j] != '\0'; j++)
            printf("%c",s[j]);
    }
    if(n < k)
    {
        for(i = 0; i < k - n; i++)
            printf("0");
    }
}

int main()
{
    int i,true_exp,biased_exp;
    float n,temp;
    int choice = 0;
    int n1;
    char ch;
    while(choice != 5)
    {
        printf("\nSelect an option\n");
        printf("1. Integer representation\n");
        printf("2. Character representation\n");
        printf("3. Floating point representation\n");
        printf("4. Double precision representation\n");
        printf("5. Exit\n\n");
        printf("Enter your choice\n");
        scanf("%d,",&choice);
        if(choice == 1)
        {
            printf("Enter any integer\n");
            scanf("%d",&n1);
            //if(n1 == 0)
            Bin_Bits(n1,32,choice);
        }
        else if(choice == 2)
        {
            printf("Enter any character\n");
            scanf(" %c",&ch);
            Bin_Bits((int)ch,8,choice);
        }
        else if(choice == 3)
        {
        	int flag1 = 0;
        	store = 0;
            printf("Enter any number\n");
            scanf("%f",&n);
            if(n > 0)
            BinaryCalculate(n);
            else if(n < 0)
            {
                BinaryCalculate(-n);
                flag1 = 1;
            }
            else
            {
                int s;
                printf("0 ");
                for(s = 0; s < 31; s++)
                {
                    printf("0");
                    if(s == 7)
                        printf(" ");

}
                continue;
            }
            if(flag1 == 1)
                temp = (-n) - (int)(-n);
            else
                temp = n - (int)(n);
            Trunc_Decimal(temp);
            //printf("%s\n",num);
            true_exp = Shift(num);//to normalize the number
            //printf("%s\n",num);//to print final normalized number
            if(flag1 == 1)
                printf("\n1 ");
            else
                printf("\n0 ");
            biased_exp = true_exp + 127;
            Bin_Bits(biased_exp,8,choice);//to print the biased exponent
            Check_Mantissa(num,choice);//to make 23 bits for the mantissa
            printf("\n");
        }
        else if(choice == 4)
        {
        	int flag2 = 0;
        	store = 0;
            printf("Enter any number\n");
            scanf("%f",&n);
            if(n > 0)
            BinaryCalculate(n);
            else if (n < 0)
            {
                BinaryCalculate(-n);
                flag2 = 1;
            }
            else
            {
                int s;
                printf("0 ");
                for(s = 0; s < 72; s++)
                {
                    printf("0");
                    if(s == 10)
                        printf(" ");

}
                continue;
            }
            if(flag2 == 1)
                temp = (-n) - (int)(-n);
            else
                temp = n - (int)(n);
            Trunc_Decimal(temp);
            //printf("%s\n",num);
            true_exp = Shift(num);//to normalize the number
            //printf("%s\n",num);
            if(flag2 == 1)
                printf("\n1 ");
            else
                printf("\n0 ");
            biased_exp = true_exp + 1023;
            Bin_Bits(biased_exp,11,choice);//to print the biased exponent
            Check_Mantissa(num,choice);//to make 23 bits for the mantissa
            printf("\n");
        }

}

return 0;
}


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