A.
main(){ int i=1,sum; while(i<=100){ sum=sum+i; i++; } printf("sum=%d",sum); }
B.
main(){ int i=1,sum=0; while(i<=100); { sum=sum+i; i++; } printf("sum=%d",sum); }
C.
main(){ int i=1,sum=0; while(i<=100) sum=sum+i; i++; printf("sum=%d",sum); }
D.
main(){ int i=1,sum=0; while(i<=100){ sum=sum+i; i++; } printf("sum=%d",sum); }