#include <stdio.h> int main(){ while(1){ int a,count=1,sum=0; printf("Input a number (0->Termination) : "); scanf("%d",&a); if(a<=0) { printf("You input 0 or minus ! Program terminated.\n\n"); return 0; } while(a>=count) sum+=count++; printf("Total sum, from 1 to %d is %d.\n",a,sum); } return 0; }
#include <stdio.h> int main(){ int a; printf("Input a number : "); scanf("%d",&a); if(a==0) { printf("End."); return 0; } switch(a%2) { case 0: printf("Your input number, %d is even number.\n",a); break; case 1: printf("Your input number, %d is odd number.\n",a); break; } return 0; }
#include<stdio.h> int main(){ int num; char grade; printf("Put the score : "); scanf("%d",&num); if(num>=90) grade='A'; else if(num>=80 && num<90) grade='B'; else if(num>=70 && num<80) grade='C'; else grade='D'; printf("Your grade is %c.\n",grade); }
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