View Compilation Error

1_734_4294_20043.c: In function 'main':
1_734_4294_20043.c:12:5: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
     for ( int k = 1;k <= n; k++ )
     ^
1_734_4294_20043.c:12:5: note: use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 to compile your code