#include <stdio.h> #include <stdlib.h> int main() { float a; printf("enter mark !\n"); scanf("%f",&a); if(a>=90) { printf("A");} else if(a>=80 &&a<=89) { printf("B"); } else if(a>=70 &&a<=79){ printf("C"); } else if (a>=60 &&a<=69){ printf("d"); }else if (a>=50&&a<= 59){ printf("e"); } else { printf("faild"); ...
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