0_0_31940930_25055.c: In function 'JC':
0_0_31940930_25055.c:20:2: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
for (int j=2;j<=i;j++)
^
0_0_31940930_25055.c:20:2: note: use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 to compile your code
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