Write a C program to find the 2’s complement of a binary number.

2’s complement of a number is obtained by scanning it from right to left and complementing all the bits after the first appearance of a 1. Thus 2’s complement of 11100 is 00100. Write a C program to find the 2’s complement of a binary number.   Program: clrscr(); printf("Enter the binary number"); gets(a); for(i=0;a[i]!='\0'; i++) { if (a[i]!='0' && a[i]!='1') { printf("The number entered is not a binary number. Enter the correct number"); exit(0); } } complement(a); getch(); } void complement (char *a) { int l, i, c=0; char b[16]; l=strlen(a); for (i=l-1; i>=0; i--) { if (a[i]=='0') b[i]='1'; else b[i]='0'; } for(i=l-1; i>=0; i--) { if(i==l-1) { if (b[i]=='0') b[i]='1'; else { b[i]='0'; c=1; } } else { if(c==1 && b[i]=='0') { b[i]='1'; c=0; } else if (c==1 && b[i]=='1') { b[i]='0'; c=1; } } } b[l]='\0'; printf("The 2's complement is %s", b); } /* Output: Enter the binary number101 The 2's complement is 011 */