View Compilation Error

0_0_36740757_29517.c: In function 'main':
0_0_36740757_29517.c:5:1: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
 for(int i=1;i<=c;++i){
 ^
0_0_36740757_29517.c:5:1: note: use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 to compile your code