Example - 1

The following example demonstrates the weakness.

foo==1;if (foo==1) System.out.println("foo\n");

called(2);return 0;void called(int foo) {}int main() {}

Example - 2

The following C/C++ example shows a simple implementation of a stack that includes methods for adding and removing integer values from the stack. The example uses pointers to add and remove integer values to the stack array variable.

// // Print stack overflow error message and exit// 

p1++;if(p1==(tos+SIZE)) {}*p1 == i;

// // Print stack underflow error message and exit// 

if(p1==tos) {}p1--;return *(p1+1);

// // initialize tos and p1 to point to the top of stack// 
// // code to add and remove items from stack// 
tos = stack;p1 = stack;...return 0;#define SIZE 50int *tos, *p1, stack[SIZE];void push(int i) {}int pop(void) {}int main(int argc, char *argv[]) {}

The push method includes an expression to assign the integer value to the location in the stack pointed to by the pointer variable.

However, this expression uses the comparison operator "==" rather than the assignment operator "=". The result of using the comparison operator instead of the assignment operator causes erroneous values to be entered into the stack and can cause unexpected results.