Basic for loop usage

1. Format: for (preparation; condition; Adjustment) {} 2. Basic and related knowledge points 1) analysis of the number of occurrences in the for loop. For (1 time; more than 1 time; more than 0 times) Note: semicolon; is required. But none of the items in the brackets is required. 2) continue. Jump out of this loop and enter the next loop. 3) in any loop, the continue and break 4) sum/10 substatements can obtain integers. To get a decimal number, you can process sum/10.0 or 1.0 * sum/10 in this way. That is to say, at least one is a decimal number. 5) (double) sum note that this formula does not convert sum to the double type, and the value represented by the second 18 sum is converted to the double type. Once the type of a variable is determined, it remains unchanged for life. 6) int sum; sum + = 2; in this case, junk data may be generated. Because sum is not initialized. This problem does not occur in java. Think that the default value of int type variables in java is 0; 7) Get used to printf ("% d", ++ I. 3. The following are attached with several routines. 1) 2)