#include<stdio.h> int main() { int n; printf("Enter num:"); scanf("%d",&n); int sum=0; for( int i=1; i<=n; i++) { sum = sum+i; } printf("%d\n",sum); return 0; } //similarly________________________ #include<stdio.h> int main() { int n; printf("Enter num:"); scanf("%d",&n); int sum=0; for( int i=1 , j=n ; 1<=n && j>=1; i++,j--) { sum=sum+j; printf("%d\n",j); } printf("sum is: %d\n",sum); return 0; }
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