prog.c: In function ‘main’:
prog.c:5:13: error: expected identifier or ‘(’ before ‘float’
int a, b, float c;
^~~~~
prog.c:9:2: error: ‘c’ undeclared (first use in this function)
c = a / b;
^
prog.c:9:2: note: each undeclared identifier is reported only once for each function it appears in