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  1. #include <stdio.h>
  2.  
  3. int main(void) {
  4. int a,b,c;
  5. scanf("%d %d %d",&a,&b,&c);
  6.  
  7. switch(c){
  8. case 1:
  9. printf("%d + %d = %d",a,b,a+b);
  10. break;
  11. case 2:
  12. printf("%d - %d = %d",a,b,a-b);
  13. break;
  14. case 3:
  15. printf("%d × %d = %d",a,b,a*b);
  16. break;
  17. case 4:
  18. printf("%d ÷ %d = %d",a,b,a/b);
  19. break;
  20. default:
  21. printf("対応していません。");
  22. break;
  23. }
  24. return 0;
  25. }
  26.  
Success #stdin #stdout 0.01s 5320KB
stdin
3 12 2
stdout
3 - 12 = -9