0_0_25600992_26575.c: In function 'main':
0_0_25600992_26575.c:19:9: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
for(int i=1; i<=n; i++)
^
0_0_25600992_26575.c:19:9: note: use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 to compile your code
0_0_25600992_26575.c:29:13: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
for(int i=2; i<=n; i++)
^
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