for (expr1; expr2; expr3) {
   some statements;
}

• expr1 is evaluated before the loop starts
• expr2 is evaluated at the beginning of each loop
  • if it is non-zero, the loop is repeated
• expr3 is evaluated at the end of each loop

 

Example:

for (i = 1; i < 10; i++) { printf("%d %d\n", i, i * i); }