0_0_34622023_21403.c:2:1: error: unknown type name 'bool'
bool leap(int n)
^
0_0_34622023_21403.c: In function 'leap':
0_0_34622023_21403.c:4:40: error: 'true' undeclared (first use in this function)
if((n%4==0&&n%100!=0)||n%400==0)return true;
^
0_0_34622023_21403.c:4:40: note: each undeclared identifier is reported only once for each function it appears in
0_0_34622023_21403.c:5:13: error: 'false' undeclared (first use in this function)
else return false;
^
0_0_34622023_21403.c: In function 'main':
0_0_34622023_21403.c:20:1: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
for(int i=1;i<=18;i++)
^
0_0_34622023_21403.c:20:1: note: use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 to compile your code
0_0_34622023_21403.c:25:1: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
for(int i=0;i<18;i++)
^
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