View Compilation Error

0_0_21336469_21915.c: In function 'main':
0_0_21336469_21915.c:32:4: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
    for(int i = 1; i <= n; i++) {
    ^
0_0_21336469_21915.c:32:4: note: use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 to compile your code