0_0_34281889_27184.c: In function 'main':
0_0_34281889_27184.c:13:9: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
for (int index = 1; index < num; index++)
^
0_0_34281889_27184.c:13:9: note: use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 to compile your code
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