cs31day4 Wk2 W

# cs31day4 Wk2 W - operators use same conventions as...

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* / + - operators use same conventions as mathematics int n; // "int" limits the variable to be an integer cout << n; // undefined behavior because n was not defined ____________________ int n; cin >> n; int m = 23 // m=23 int p = 2 * m // p=46 double x = -2.76; double y = 12.345e-7; // y= 12.345 x 10^-7 double z = 23; // uses 23.0 int r = 3.89; // uses 3; it ignores the fraction portion if an operation contains at least one double and an integer, the answer will be a double. if an operation is between two integers, then the answer will be an integer 19.3/5.0 --> 3.86 19.3/5 --> 3.86 19/5.0 --> 3.8 significant figures 19/5 --> 3 cout << m / 2; // writes 11, not 11.5 % - modulus operater [gives the remainder] int t = m % 2; // sets t to 1 --> 23/2 = 11 remainder 1 find even/odd numbers using [# % 2]. if remainder is -, then even. If remainder is odd, then odd number. int a = 10; int b = a*a; int c = 25/(b-100); // problem! will divide by zero.

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// undefined behavior. programmer can tell program to do whatever they want. will probably crash by default int d = 1000; int e = d * d * d; int f = e * d;
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cs31day4 Wk2 W - operators use same conventions as...

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