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#include <stdio.h>
 
int main(void) {
	float sum,diff
	printf("hello world");
	diff=20-10
	printf("20-10=%f",diff);
 
	return 0;
}
 

prog.c: In function ‘main’:
prog.c:5:2: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘printf’
  printf("hello world");
  ^~~~~~
prog.c:6:2: error: ‘diff’ undeclared (first use in this function)
  diff=20-10
  ^~~~
prog.c:6:2: note: each undeclared identifier is reported only once for each function it appears in
prog.c:7:2: error: expected ‘;’ before ‘printf’
  printf("20-10=%f",diff);
  ^~~~~~
prog.c:4:8: warning: unused variable ‘sum’ [-Wunused-variable]
  float sum,diff
        ^~~

Standard output is empty