2s complement in C

by Online Tutorials Library July 14, 2022

What is the 2s complement in C?

The 2s complement in C is generated from the 1s complement in C. As we know that the 1s complement of a binary number is created by transforming bit 1 to 0 and 0 to 1; the 2s complement of a binary number is generated by adding one to the 1s complement of a binary number.

In short, we can say that the 2s complement in C is defined as the sum of the one’s complement in C and one.

In the above figure, the binary number is equal to 00010100, and its one’s complement is calculated by transforming the bit 1 to 0 and 0 to 1 vice versa. Therefore, one’s complement becomes 11101011. After calculating one’s complement, we calculate the two’s complement by adding 1 to the one’s complement, and its result is 11101100.

Let’s create a program of 2s complement.

  #include <stdio.h>  int main()  {     int n;  // variable declaration     printf(“Enter the number of bits do you want to enter :”);     scanf(“%d”,&n);     char binary[n+1];  // binary array declaration;      char onescomplement[n+1]; // onescomplement array declaration      char twoscomplement[n+1]; // twoscomplement array declaration     int carry=1; // variable initialization     printf(“nEnter the binary number : “);     scanf(“%s”, binary);     printf(“%s”, binary);     printf(“nThe ones complement of the binary number is :”);          // Finding onescomplement in C     for(int i=0;i<n;i++)     {         if(binary[i]==’0′)         onescomplement[i]=’1′;         else if(binary[i]==’1′)         onescomplement[i]=’0′;     }     onescomplement[n]=’

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2s complement in C

What is the 2s complement in C?

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