c语言找错，那里不对呢？编译连接时没有判错，但运行时提示遇到问题需要关闭

#include <stdio.h>
int main(void)
{
char a,c;
unsigned int b;
printf("\nEnter a letter:");
scanf("%c",a);
printf("\nEnter a number:");
scanf("%u",b);
printf("\nEnter another letter:");
scanf("%c",c);
return 0;
}

#include <stdio.h>
int main(void)
{
char a,c;
unsigned int b;
printf("\nEnter a letter:");
scanf("%c",&a); //
printf("\nEnter a number:");
scanf("%u",&b); //
printf("\nEnter another letter:");
scanf("%c",&c); //
return 0;
}

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