C basic programming: (1) select all three numbers without repeated numbers from the four numbers.

Question: How many three numbers can be composed of 1, 2, 3, and 4 numbers that are different from each other and have no repeated numbers? What is it?

ProgramAnalysis: Numbers that can be entered in hundreds, ten, and one digit are 1, 2, 3, and 4. Make up all the arrays and then remove those that do not meet the conditions.

Code: 4select3. c

# Include "stdio. H "int main (INT argc, char * ARGs []) {int Limit = 4; count (Limit); Return 0;} int count (INT limit) {int sum = 0, I, J, K, Count = 0; for (I = 1; I <= limit; I ++) {for (j = 1; j <= limit; j ++) {If (J! = I) {for (k = 1; k <= limit; k ++) {If (K! = J & K! = I) {count ++; sum = I * 100 + J * 10 + k; printf ("-- % d", sum); If (count % 2 = 0) {printf ("\ n") ;}}}} return 0 ;}