0_0_35326176_22447.c: In function 'main':
0_0_35326176_22447.c:9:5: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
for(int i=2;i<22;++i){
^
0_0_35326176_22447.c:9:5: note: use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 to compile your code
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