~   Bitwise Operators in C, Binary Ones Complement Operator is unary and has the effect of 'flipping' bits.

C Programming Language Operators and Enums in C Language (Article) Operators and Enums in C Language (Program)

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Program:

#include"stdio.h"
void main()
{
   unsigned int a = 60;	/* 60 = 0011 1100 */  
   int c = 0;  
   c=~a;       
   printf(" Value of c is %d\n",c );
}

Output:

 Value of c is -61
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