The computer runs printf("%c, ",b++); Statement,
The output format is %c character format.
So first output the character b, which is 2, and then add1to b;
At this time, b=3, and asc code value is 5 1.
Then run printf("%d\n ",b-a);
The output format is %d plastic format.
So the difference between the asc code value of B and the asc code value of A is output;
That is 51-49 = 2;
So the running result of the program is 2, 2.