C Language Learning _ for Loop

Print the triangle code:

# Include

Int main (void)

{

Inti, j, n;

Printf ("inputn :");

Scanf ("% d", & n );

For (I = 0; I <n; I ++)

{

For (j = I + 1; j <n; j ++)

Printf ("");

For (j = 0; j <2 * I + 1; j ++)

Printf ("*");

Printf ("\ n ");

}

Return0;

}

Multiplication table:

# Include

Int main (void)

{

Inti, j;

For (I = 1; I <= 9; I ++)

{

For (j = I; j <= 9; j ++)

Printf ("% d * % d = %-3d", I, j, I * j );

Printf ("\ n ");

}

Return0;

}

1*1 = 1 1*2 = 2 1*3 = 3 1*4 = 4 1*5 = 5 1*6 = 6 1*7 = 7 1*8 = 8 1*9 = 9

2*2 = 4 2*3 = 6 2*4 = 8 2*5 = 10 2*6 = 12 2*7 = 14 2*8 = 16 2*9 = 18

3*3 = 9 3*4 = 12 3*5 = 15 3*6 = 18 3*7 = 21 3*8 = 24 3*9 = 27

4*4 = 16 4*5 = 20 4*6 = 24 4*7 = 28 4*8 = 32 4*9 = 36

5*5 = 25 5*6 = 30 5*7 = 35 5*8 = 40 5*9 = 45

6*6 = 36 6*7 = 42 6*8 = 48 6*9 = 54

7*7 = 49 7*8 = 56 7*9 = 63

8*8 = 64 8*9 = 72

9*9 = 81

# Include

Int main (void)

{

Inti, j;

For (I = 1; I <= 9; I ++)

{

For (j = 1; j <= I; j ++)

Printf ("% d * % d = %-3d", I, j, I * j );

Printf ("\ n ");

}

Return0;

}

1*1 = 1

2*1 = 2 2*2 = 4

3*1 = 3 3*2 = 6 3*3 = 9

4*1 = 4 4 4*2 = 8 4*3 = 12 4*4 = 16

5*1 = 5 5*2 = 10 5*3 = 15 5*4 = 20 5*5 = 25

6*1 = 6 6*2 = 12 6*3 = 18 6*4 = 24 6*5 = 30 6*6 = 36

7*1 = 7 7*2 = 14 7*3 = 21 7*4 = 28 7*5 = 35 7*6 = 42 7*7 = 49

8*1 = 8 8*2 = 16 8*3 = 24 8*4 = 32 8*5 = 40 8*6 = 48 8*7 = 56 8*8 = 64

9*1 = 9 9*2 = 18 9*3 = 27 9*4 = 36 9*5 = 45 9*6 = 54 9*7 = 63 9*8 = 72 9*9 = 81

These two questions are basic beginners, but they are the classic study of for loop. As a sister of the loop, for loop is very important. In fact, I have never understood the loop, these two questions are just a small summary.