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#include <stdio.h>
 
main() {
 
int num1=18, num2=9;
float decimal1=2.5, decimal2 1.5;
 
printf("18/9 = %d\n\n", num2/num1);
printf("1.5/2.5 = %.3f\n\n", decimal2/decimal1);
printf("3+6*10 = %d\n\n", 3+6*10);
printf("(3+6)*10 = %d\n\n", (3+6)*10);
 
return 0;
}

prog.c:3:1: warning: return type defaults to 'int' [-Wimplicit-int]
 main() {
 ^
prog.c: In function 'main':
prog.c:6:30: error: expected '=', ',', ';', 'asm' or '__attribute__' before numeric constant
 float decimal1=2.5, decimal2 1.5;
                              ^
prog.c:9:30: error: 'decimal2' undeclared (first use in this function)
 printf("1.5/2.5 = %.3f\n\n", decimal2/decimal1);
                              ^
prog.c:9:30: note: each undeclared identifier is reported only once for each function it appears in

Standard output is empty